短语
中文翻译：在
同义词：
['at the point of', 'at the moment of例句：1. At the sign of the moon', 'we should go home.（月相变化时，我们应该回家。）']
例句：
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1. At the sign of the moon, we should go home.
月相变化时，我们应该回家。
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2. The meeting was called to order at the sign of the hour.
会议准时开始。
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3. He signed the contract at the sign of the law.
他在法律允许的范围内签字了合同。