讲解文本：

buckle up 系好安全带，把…扣紧
Hey man! Buckle up. It's safe. It's the law!
哥们，系上安全带！这样才安全啊，而且这是法律规定。
Please buckle up now. We're about to land.
现在请系好安全带，我们要着陆了。

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