Lynchpin
n. 关键
✅ 同义词
🗣️ 情景例句
You made a tough decision.
你做了一个困难的决定。
I won't check this baggage
这件行李我不托运。
A woman saw it happen when she was walking past.
一位妇女走过的时候，看到我的钢笔掉了。