"The Sharpeville and Langa massacres were a tipping point in that they served to trigger off deep revulsion and disgust, both locally and internationally, against the apartheid government."

VOA: standard.2010.03.21

Tipping my hand, it seems pretty clear that that seems like the right thing to say about these chess-playing programs.

我先亮出我自己的观点,显而易见,这个问题正好能够,对国际象棋程序做出解释

耶鲁公开课 - 死亡课程节选

Can you tell us about tipping?

你能跟我说说关于小费的事么？

一定要给小费 - SpeakingMax英语口语达人