有些还打到罐子，那是他不须怀疑的，因为它们发出声音来了。他见他们没有回音，所以丢第二次和第三次的石子，他猜想不出他们对暗号何以没有反应。

As there was no response , he threw stones a second and a third time, and could not imagine why there was no answer to his signal.

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人工“计数器”们催促收到问卷却没有回音的家庭，但是分发给他们掌上电脑的计划不得不被取消。

But a plan to issue handheld computers to the “enumerators” for chivvying non-replying households had to be cancelled.

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查伦格说，如果你投简历的公司没有回音就不必给他们打电话。

Mr. Challenger says there's no need to call employers you sent a résumé to if you haven't heard back from them.

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