primary cave
主洞
以上为机器翻译结果，长、整句建议使用 人工翻译 。
The caving crew descends through tight passages hundreds of feet beneath the Earth's surface, guided by the gust of air that marks the cave's primary passage.
FORBES: Magazine Article
Every time she won another primary, despite the increasing odds against her, she demonstrated she wouldn't cave under pressure.
NPR: Despite Loss, Clinton's Success a Stride for Women
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