英语翻译请教下面这个句子怎样翻译:the crossbeam must be raised before the filler moves so far forward as to hit the crossbeam.

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英语翻译请教下面这个句子怎样翻译:the crossbeam must be raised before the filler moves so far forward as to hit the crossbeam.
英语翻译
请教下面这个句子怎样翻译:the crossbeam must be raised before the filler moves so far forward as to hit the crossbeam.

英语翻译请教下面这个句子怎样翻译:the crossbeam must be raised before the filler moves so far forward as to hit the crossbeam.
横梁必须在封板移动前升起,以避免它(封板)向前移动过快而撞到横梁.