名词
中文翻译：主要信号
同义词：
['primary indication', 'primary indicator例句：1. The primary signal for the earthquake was a rumbling beneath the ground.（地震的主要信号是地下的震动。）']
例句：
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1. The primary signal for the earthquake was a rumbling beneath the ground.
地震的主要信号是地下的震动。
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2.The primary signal from the satellite was a sudden drop in temperature.
卫星发出的首个信号是温度的急剧下降。
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3. The primary signal for the new policy was the need to improve public services.
新政策的第一个信号是改善公共服务的需求。