go back on one's words

Once Nature finds a good device it will have to go on using it because it is impossible to go back to the drawing board and design another one.

一旦自然发现了一个好的装置，她就会一直用它，因为不可能再从草图开始重新设计一个全新的。

Let's pretend to go back in time, and observe life on Mars and Venus -before the planets discovered one another or came to Earth we can gain some insights into men and women.

让我们假装回到从前，观察火星和金星上的生活——在地球未彼发现或他们未来到地球以前——我们可以观察到男人与女人。

"We've been working on it for quite a while," said Ferguson of the signing. "We identified him quite a while back as one we should go for.

“在这笔签约问题上，我们已经努力了很久了，”弗格森说，“我们认为他就是我们应该追求的人，他很年轻，速度极快，还十分沉着。