Reciprocant
微分不变式
🗣️ 情景例句
I'm really impressed by your show.
你的展览让我留下了深刻的印象。
I really should be on my way.
我真的该告辞了。
Our next obstacle was a shallow pool of water about half a mile across.
下一个障碍是一片约半英里宽的浅水塘。