They slither while they pass.是什么意思？

They slither while they pass.

它们划过时尽显其飘逸之姿.

they

pron. 他/她/它们，人们，大家，政府，当局，她们；

例句
The storms had abated by the time they rounded Cape Horn.
他们绕过合恩角时，暴风雨已经减弱。

slither

vi. 滑动，滑

例句
I felt the December air slither down my leg.
我感觉到十二月的冷风沿着腿直往下钻.

while

conj. 在…期间，与…同时，虽然，

例句
A Dr Matthew Owens was reported missing while on an expedition to north-eastern Turkey.
据报道，一位叫马修·欧文斯的博士在前往土耳其东北部考察的途中失踪了。

pass

vt.& vi. 走过，通过，批准，度过；vt. 传球，及格，发生，不要；n. 通道，通行证，关口，越过；

例句
Having read the book, she will be able to pass on the acquired knowledge to trainee teachers.
读完此书，她便能将从书中所得传授给实习教师。