应铃声开门;
My mother went to answer the bell.
我母亲听见铃声便出去开门.
I rang the bell, but there was no answer.
我按了门铃,但没有人应门。
He interrupted his work to answer the bell.
他中断了他手头的工作去开门.
I've been ringing the door bell, there's no answer.
我一直按门铃,但是没有人应门。
Presenters have a short duration, usually 5 minutes, to give their presentation and answer questions. At the end of the five minutes, the facilitator rings a bell.
演讲者只有很短的时间进行演讲并回答问题,通常为5分钟。
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