Metavariable
[计] 元变量
🗣️ 情景例句
I really want to go back to work,
我真的想回去工作，
Easier said than done.
说时容易做时难。
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。