The timing between successive waves is around 20 minutes.
连续波浪之间的时间间隔大约是二十分钟。
Mankind is forced to use the technology to fend off three successive waves of alien invasions.
人类不得不采用这种技术抵御三波外星人连续入侵。
Mankind is forced to use the technology to fend off three successive waves of alien invasions.
人类不得不采用这种技术抵御三波外星人连续入侵。
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