electromagnetic wave abnormal change的用法和樣例：
例句
- Rock movements during an earthquake can make rivers change their course.
地震過(guò)程中巖石的運動(dòng)能使河流改道。 - From these wave arrival times, seismologists can calculate the distance of an earthquake from each seismograph.
根據這些波到達的時(shí)間，地震學(xué)家們能夠計算出地震離地震儀的距離。
