名词
中文翻译：Unknown
同义词：
['principal', 'primary', 'chief']
例句：
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1. The primacord is the first thing I see when I wake up in the morning.
我醒来时首先看到的是那条首要线索。
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2. The primacord was the only way to reach her at that time of day.
在那个时间，首要线索是她唯一的联系方式。
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3. The primacord was a crucial piece of evidence in the case.
这条首要线索是案件中至关重要的证据。