我们在门口踟躇了一下，准备敲门。
We hesitated at the door for a moment, and were about to knock.
我们驱车挨门逐户拜访，一家一家地敲门，准备开始我们的任务。
We drove from house to house, knocking on doors, ready to begin our mission.
一个夏日的傍晚，我正在准备晚餐时，忽然听见有人敲门。
One summer evening as I was fixing supper, there was a knock at the door.
一定要使自己在良机敲门时已作好准备。
一定要使自己在良机敲门时已作好准备。
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