The origin time should be a few seconds before the time of the wave at the first station.

地震的起源时间应该比到达第一个站点的时间早几秒钟。

youdao

The origin time should be a few seconds before the time of the wave at the first station.

地震的起源时间应该比到达第一个站点的时间早几秒钟。

youdao