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背单词
periastron
periastron
美
英
n.
〔天〕近星点
网络
远星点
词形变化
复数:
periastrons
英汉解释
n.
1.
〔天〕近星点
英英解释
n.
1.
the
points
in
space
and
time
in
the
orbits
of
two
stars
in
a
binary
system
at
which
they
are
closest
together
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