名词
中文翻译：初级波
同义词：
['primary oscillation', 'primary waveform例句：1. The primary wave of the earthquake was felt in the city.（地震的初级波在城市中感觉到了。）']
例句：
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1. The primary wave of the earthquake was felt in the city.
地震的初级波在城市中感觉到了。
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2. The primary wave is traveling at a speed of about 7.8 km/s.
初级波以大约7.8千米/秒的速度传播。
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3. The primary wave has been observed to travel through the Earth's crust.
初级波已被观察到穿过地球的地壳。