When a strong earthquake occurs on the ocean floor rather than on land,
a tremendous force is exerted on the seawater.
我想請問,a tremendous force exert 不是主動嗎(這股力量主動影響海水)?
為何這句會用被動態?
感謝各位!

這股力量是被施加的 a tremendous force is exerted (bythe earthquake) on...