Definition: a sudden movement caused by an explosion, accident, etc. Level: C2
爆炸后，该地区检测到一次突然的震动。
A sudden ___shock was detected in the region following the blast.
事故使整个建筑产生一阵震动。
The accident sent a ___shock through the entire building.
地震的首次震动之后是几次余震。
The earthquake's initial ___shock was followed by several aftershocks.
