He had many a time heard of this thing succeeding but never of its failing before.

他曾多次听说这件事成功了，但从来没有听说过它的失败。

youdao

After this technique had been invented, it was only a matter of time before weapons designers adapted it for the detection of submarines.

"这项技术被发明之后，武器设计者将其改造用来探测潜艇只是时间早晚的问题。

youdao

This is the first time that blind people have ever done individual studies before a product was put on the market.

这是盲人第一次在产品投放市场之前进行个人研究。

youdao

Three times in recent weeks, Republicans have used parliamentary tactics in the Senate to block the extension of benefits, angering the president at a time when he is trying to move this and other legislation through Congress before the congressional recess.

VOA: standard.2010.07.19

If you never meditate before, this is a wonderful opportunity to do it for the first time.

如果你从没冥想过，这是你们尝试的好机会。

哈佛公开课 - 幸福课课程节选

So, every time you're exposed to a new vaccine or a new antigen you go through this primary response before you have the secondary response.

所以,每当你接触到新疫苗或是新抗原,在再次免疫之前,机体将会经历这样的初次免疫过程

耶鲁公开课 - 生物医学工程探索课程节选

For tennis fans, it was a strange sight: it will be a long time before this historic stadium sees "the wave" go around four times at as it did this evening.

WSJ: Social Media

It is only a matter of time before this regime comes to an end.

WHITEHOUSE: Press Briefing

If lower-priced Chinese tourbillon watches flood the market then it is only a matter of time before this sentiment spreads.

FORBES: The Eroding Exclusivity Of The Tourbillon Watch