机会只会敲一次门。
机会也许只敲一次门，但试探却总是在按门铃。
Opportunity may only knock once, but temptation is always at the door bell.
然而他们注定不会分离。 几十年来，劳拉一次又一次地在克莱门斯的梦中出现。
Yet they did meet, time and again, over the years, in Clemens’ dreams.
我打开拖车的门，第一次看到了海军陆战队的机修车间。
When I opened the doors, I had my first look ever at a machine shop.
那是他第一次开那门课,当然我也希望从中学到很多东西。
I think it was the first time he taught it and I hope to learn a lot since then.
他门每月会面一次。
有一位部门经理，有一次外出时丢失了手提包，里面除了一些钱物，还有公司的公章。
A department manager, have lost a bag when they go out, which in addition to some money, as well as the company's official seal.
有一次，我家楼的公共防盗门坏掉了。
One time, the public security door of our building was broken.
于是我弄了个门钥匙，那是我最后一次见到他。
有一次，一只鸟撞倒了我家的玻璃门。
他们一次又一次地向门冲去。
记得我最后一次离开家，你开着门关久不肯关。
Still remembered last time I left home; you kept the door open wide.
我想，太阳之井的“门”是你对我们的最后一次打击。
那只狗一次又一次地抓门。
席门斯了解到这是第一次有人如此鼓励这个女孩。
Simmons realized that this was the first time anyone had ever encouraged the girl.
青蛙一次又一次地敲着门。
青蛙一次又一次地敲着门。
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