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aftershock

noun
🔊/ˈɑːftəʃɒk/
🔊/ˈæftərʃɑːk/
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  1. a small earthquake that happens after a bigger one（地震后的）余震
    • The area suffered a series of aftershocks measuring up to 6.3 on the Richter scale.该地区遭受了一系列余震，最高可达里氏6.3级。
    Topics The environmentc2