Regular repeating actions such as sound waves, light waves, or radio waves have a certain frequency, or number of waves per second.

有规律的重复活动如声波、光波、无线电波都有一个特定的频率，或者说是每秒的波动次数。

《柯林斯英汉双解大词典》

That may sound odd, but the fact is at the moment of the Big Bang, both matter and anti-matter were created for a short time, and I mean just a fraction of a second.

这听起来可能很奇怪，但事实是在大爆炸的那一刻，物质和反物质都是在很短的时间内被创造出来的，我的意思是只有几分之一秒。

youdao

youdao

(Sound) Meanwhile in Kabul, Afghans clashed with police for the second day during protests held over allegations that foreign troops had desecrated the Muslim holy book,the Koran.

VOA: standard.2009.10.26

And this is going to sound like a weird topic, we're going to see why it's of value in a second.

这听起来像个怪异的主题，我们将会去学习一刹那。

麻省理工公开课 - 计算机科学及编程导论课程节选

The second one is going to be sound that's going to come on at the end.

第二段影片的最后会有些声音

耶鲁公开课 - 心理学导论课程节选

Their second sound piece of advice is that philanthropists should work together more often.

ECONOMIST: The lessons of philanthropy: Giving for results | The

Not all of it can be done in neatly phrased eight-second sound bites.

WHITEHOUSE: Press Briefings

The site will include feeds for livestream events "as they are taking place instead of the 10-second sound bites provided by the corporate media".

BBC: Two men wearing V for Vendetta masks