The house was not very old. It ought not to have been knocked down.
那栋房子并不太旧，不该拆掉。
The bike could have lasted longer if it had not been knocked about so much.
要不是那样乱丢乱摔，这辆自行车还可以多用些时候。
The diamond must have got knocked out of my ring when I dropped it.
我把戒指掉在地上时，钻石一定是被摔掉了。
The diamond must have got knocked out of my ring when I dropped it.
我把戒指掉在地上时，钻石一定是被摔掉了。
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