名词
中文翻译：Unknown
同义词：
['essential', 'necessary']
例句：
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2.
用于否定句中
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3.
用于肯定句中
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1. It is essential for us to follow the instructions carefully.
我们仔细遵循指示是至关重要的。
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2. He was not necessarian to attend the meeting.
他没有必要参加会议。
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3. The decision was made necessarianly due to the lack of resources.
由于缺乏资源，这一决定是不得已而为之。