half-life

half-life

美 　英

• n.半衰期；（放射性物质的）半衰期
• 网络半条命；战栗时空；半生期

词形变化

复数：half-lives  

英汉双解

英汉解释

na.	1. 【核】半衰期〔放射性同位素分裂[从生物体中排出]一半量的时间〔也作 half life 或 half life period〕〕

英英解释

n.	1. the amount of time that is needed for a substance to lose one half of its radioactivity

例句

But the half-life of market domination seems to be dwindling.

但是似乎这些公司的垄断半衰期一直在缩短。

It accumulates in the cooling water of nuclear reactors and is often vented in small amounts to the environment. Its half-life is 12 years.

氚聚集在核反应堆的冷却水中，通常以微量排放到环境中，其半衰期为12年。

When Hazen's team put oil samples in a laboratory setup designed to mimic Gulf conditions, it had a half-life of between one and six days.

当黒曾团队将油样放入模拟的海湾背景下的实验室，油样有一个在一天和六天之间的半衰期。

"Half-Life 2" , which came out in 2004, took six years to develop, whereas new episodes can be put together in a year or so.

2004年发行的《半条命2》花费了六年时间开发，而游戏的新章节仅需一年左右就可完工。

In particular, the half-life of ethyl mercury is short (less than 1 week) compared with that of methyl mercury (1. 5 Months).

特别是乙基汞的半衰期较短（少于1周），而甲基汞的半衰期为1.5个月。

Furthermore, the long half-life of the metabolites could cause their accumulation and induce apparent injuries of target organs.

而且，此代谢物的半衰期极长。故极易累积于体内造成标的器官明显的伤害。

Iodine-131 has a half-life of about a week, meaning that levels in water could fall quickly if new doses aren't introduced.

碘-131的半衰期在一个星期左右，所以如果没有新的剂量进入，水中的放射性可能就会很快下降。

Scientists estimate the half-life of CO2 might be close to a hundred years.

科学家估计，二氧化碳的半衰期可能接近于100年。

Iodine-131 has a half-life of roughly a week, which means levels could fade if new radioactive material isn't added.

碘-131的半衰期约为一周，也就是说如果没有新的放射性物质加入，辐射水平有望降低。

Half-life is the time required for half the quantity of the protein to be broken down and eliminated from the joint space.

半衰期指一半蛋白从关节腔中分解和消失用的时间。

Such a short half-life to facilitate the treatment of the operation, but also easy to play a role in radioactive antibody.

如此短的半衰期便于治疗操作，也便于放射性抗体发挥作用。

This half life of technical skills is without parallel in any other industry.

技能的日新月异是其它任何行业都无法相提并论的。

Near my home in a small yard , as if there is a small half-life is necessary to bloom .

在我家附近的一间小破屋子里，仿佛半有一个小生命就要绽开，却又含苞欲放。

So, it become one of important tasks of recombined peptides drugs reconstruction to prevent degradation rapidly and prolong half-life of.

防止多肽在体内迅速降解、延长半衰期成为蛋白质工程药物改造的重要课题之一。

Their half-life in the body is estimated to be seven to eleven years.

它们在体内的半衰期估计为7至11年。

With a 30-year half-life, dangerous amounts can remain for years in pasture that might be grazed by livestock.

因为铯-137的半衰期长达30年，所以放牧牲畜的牧场可能会持续几年都含有危险剂量的辐射。

Half-Life showed us very well that you could add a deep story into a game and the player would be thrilled to play it.

Half-Life很好的向我们展示了你可以再游戏中添加深刻的故事，玩家会玩的很激动。

Cesium-134 is considered somewhat less of a long-term problem because it has a half-life of two years.

铯134被认为影响没有那么长久，因为它的半衰期是两年。

The compositions and methods are useful for modulating the plasma circulation half-life of an active agent.

这些组合物和方法可有效调节活性药物的血浆循环半衰期。

Very long half-life of plutonium, will enter the body with breathing a high likelihood of cancer.

钚的半衰期非常长，随呼吸进入人体后会致癌的可能性极高。

Old masons thinking along while, he thought he worked hard, more than half life soon have burn up.

老石匠思索了半天，他想到自己辛苦操劳了多半辈子，生命很快就有燃尽了。

L-dopa prodrug AEPD is able to increase the bioavailability and lengthen the half life of L-dopa.

将左旋多巴利用前药原理修饰成乙酰左旋多巴乙酯能够显著提高左旋多巴的生物利用度和延长左旋多巴的半衰期。

By contrast, the half-life of a cordless phone for the home is measured in years.

相反，家用无绳电话的使用期却是有些年头的。

Over the long term, the big threat to human health is cesium-137, which has a half-life of 30 years.

长期以来，对人体健康的一大威胁就是铯137，它的半衰期为三十年。

The danger of nitrogen-16 is an issue only for plant workers and operators because its half-life is only seven seconds.

氮-16只对电厂的工人和操作人员存在危险，因为它的半衰期只有七秒中。

Cesium-137, with a half-life of 30 years, is another dangerous substance emitted in a full-scale nuclear meltdown.

核反应堆完全熔解后，会释放出另一种危险物质铯-137。铯-137的半衰期为30年。

Besides, the also has such advantages as long half-life, and little influence of environment to the immobilized system.

同时与其它酶固定化方法相比较，具有半衰期长，固定化体系受外界环境影响小等特点。

Currently, PEGylation is commonly used as an effective method to prolong its half-life in serum.

聚乙二醇修饰是目前有效地延长其半衰期的方法。

Half-life (elimination) is the time required for the plasma drug concentration or the amount of drug in the body to decrease by 50%.

半衰期（消除）是指血浆药物浓度或体内药物数量降低50%时所需的时间。

Obviously the gaming selection is still a little limited here, but Half-Life 2 and Portal 2 played full-res without a hitch.

显然游戏选择仍然有些限制，但是半条命2和传送门2全开没有任何延迟。

The city's challenge, chiefly, is to dispose of cesium-137, a radioactive isotope with a half-life of 30 years.

这座城市面临的最大问题就是处理铯—137，这是一种半衰期为30年的放射性同位素。

taking stable iodine as a pill blocks the uptake of the hazardous radioisotope, which has a half-life of 8 days.

服用稳定的碘元素会阻止危险碘同位素的摄入，碘同位素的半衰期仅为八天。

Half-life is the time it takes one-half of the atoms of a radioactive material to disintegrate.

半衰期是指放射性物质的原子有半数发生衰变时所需要的时间。

One of the first tunnels. Probably, the first Half-Life video game was created on the base of the one of such objects.

首批隧道之一。大概第一部“半条命”电视游戏是以一个这样的场所为基地设计的。

As a result, a polymer with a appropriate Mw as well as a neutral charge can possess a long half-life in plasma.

所以分子量大于3万，且为中性电荷的聚合物在血浆内半衰期长。

But the half-life of these fake packages has been getting shorter.

但是，这些“伪”方案的半衰期变得越来越短。

Half-life: the number of radioactive nuclei decay and reduced by half the time required for the initial value.

半衰期：放射性原子核的数量因衰变而减少为初始值一半所需的时间。

Iodine-131 has a half-life of eight days and is quite dangerous to human health.

碘131的半衰期为八天，对人体健康损害十分巨大。

The time it takes for half of its original amount to decay is called the half-life.

衰变至只剩下原来数目一半所需的时间称为该核素的半衰期。

For all this, these compound existence's half-life is short.

尽管如此，这些化合物存在的半衰期非常短。