Mathematical pendulum
[化] 数学摆
🧩 词语组成解析
🗣️ 情景例句
I'm still learning.
我还在学习当中。
He's absorbed in his book.
他全神贯注地读书。
Which may keep company with the vessel for an hour without visible or more than occasional movement of wing.
它们随船飞行一小时也难得见其扇动一下翅膀。