When on a spacewalk, astronauts use safety tethers to stay close to their spacecraft.

当宇航员在太空行走时，他们会使用安全绳以保持他们与飞船的距离。

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What was his grief when on looking up toward the boxes, he saw that the Fairy had disappeared!

当他抬头望着那些盒子时，他发现仙女已经不见了，他非常悲伤！

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When on holiday, I just want to relax.

放假的时候，我只想放松一下。

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Professor Pace has a warning for people who let water hit their face when they first turn on the shower.

VOA: special.2009.10.13

A woman can be proud and stiff When on love intent; But Love has pitched his mansion in ; The place of excrement; For nothing can be sole or whole That has not been rent."

坟或床都无能为力,“当女人专注爱情之时;,她总会高傲自得,但爱情却把它的居所;,设在排泄之处,要明白凡事若要完美，都必须先撕破“

耶鲁公开课 - 现代诗歌课程节选

Can't complain when the whole North East on the other side of the country is getting piled with snow.

当美国东北区白雪皑皑时，在这儿我们也不会抱怨寒冷。

旧金山的天气 - SpeakingMax英语口语达人

When on the 10th day the police found the body, I had to escape to Syria.

CNN: STORY HIGHLIGHTS

But even when on a break, the job doesn't leave you, says Mrs Sanders.

BBC: 'Always on edge' - a carer's life

Industry research overwhelmingly demonstrates that Wi-Fi is now the preferred free-access technology for mobile devices when on-the-go.

ENGADGET: JiWire, AWG use location-based ads to spread free airport WiFi in the US