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闸轮机构
🗣️ 情景例句
Medicine should be stored somewhere your kids can't reach it.
药物应摆放在孩子们够不着的地方。
In college I majored in science, What was your major?
大学时我主修自然科学，你主修什么呢？
We'll take that one.
我们就买那种。