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There were doorknobs and doorbells where one touch had covered another beforehand .

还有事前已被触摸，层层覆盖的门把和门铃。

Japanese kids will now often use their thumb to ring doorbells and to point at things .

日本儿童现在会经常用他们的拇指按门铃和指东西。

Parcel deliveries are often thwarted by menacing dogs , doorstep thieves , unanswered doorbells or a host of other impediments that keep goods from their intended destination .

派送包裹常常会遇上诸如恶犬、守门贼、主人不在家等各种突发状况的干扰，使得货物不能被送达指定目的地。

The trained canines alert their owners to important sounds , such as doorbells , smoke alarms and ringing telephones .

训练过的犬提醒主人对如门铃，烟雾警报器和电话铃声这些重要声音提高警觉。