The principal dwelled ______ traffic safety in his talk.

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The principal dwelled ______ traffic safety in his talk.
The principal dwelled ______ traffic safety in his talk.

The principal dwelled ______ traffic safety in his talk.
填上"on"
dwell on 意思是:细想,详述
整句话的意思是:校长在他的讲话中详述了交通安全.