动词短语
中文翻译：势在必行
同义词：
['be compelled to do', 'be obliged to do']
例句：
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1. The government has decided that the new regulations must be implemented immediately.
政府已经决定必须立即实施新的规定。
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2. He was compelled to accept the offer because he had no other choice.
他被迫接受这个提议，因为他别无选择。
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3. It is essential that we act now before it's too late.
我们必须要行动起来，否则太晚了。