std. by
美
英 
例句
You can get an STD by having unprotected sex with a partner who's infected.
可以通过与感染者的无防护性行为而感染性病。
Comparative analysis on the differences in epidemic situation of STD by different epidemic situation report systems
不同疫情报告系统性病疫情差异对比分析
Studied on High- quality STD by Water Methods
水法制高纯杀虫单原粉新技术研究