I waited my chance and slipped out when no one was looking.

我等待时机，趁没人注意时溜了出去。

《牛津词典》

She'd promised to give him driving lessons, on the quiet, when no one could see.

她答应在无人看见时秘密地给他上驾驶课。

《柯林斯英汉双解大词典》

youdao

These problems may appear and then disappear, sometimes resulting in long periods when there are no problems at all.

VOA: special.2009.01.06

It's OK now. But when I was younger, I cried at night when no one was looking.

现在好了，但我年轻那会儿，我经常在,夜里没人看见的时候一个人哭。

麻省理工公开课 - 媒体、教育、市场课程节选

In terms of why universities need Muslim chaplains, when I was at NYU as an undergrad, we had no central authority to figure.

就大学为什么需要穆斯林教士而言，当我还是纽约大学的学生时，我们没有一个核心领导。

普林斯顿公开课 - 人性课程节选

That means they're prone to intervene and take positive action when no one else will.

CNN: What made London Samaritan so brave

"When no-one else would look at Apple, we were there, " says Elite founder Thomas Armes.

FORBES: Class-Action Suit Filed Against Apple

The Mexican players were livid when no penalty was called, surrounding Guatemalan referee Walter Lopez.

WSJ: U.S., Mexico Tie 0-0 in World Cup Qualifier