Rearguards
(rearguard 的復數) n. 后衛
??? 情景例句
Take the time, Susan.
別那么忙， Susan。
She's such a pain in the neck.
她是個如此討厭的人。
To escape from the Earth in a rocket, one must travel at seven miles per second.
要乘坐一枚火箭飛離地球，火箭的速度要達到每秒7英里，