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n. 纵梁, 楼梯基
✅ 同义词
🗣️ 情景例句
You're a real friend!
你是个真正的朋友！
I was little ill at ease.
我有点不自在。
Ships may be delayed by storms; flights may be cancelled because of bad weather, but trains must be on time.
轮船船期可能因风暴而推延，飞机航班可能因恶劣天气而取消，唯有火车必然是准点的。