碰到

pèng dào zhè zhǒng jī huì bù yào cuò guò

碰到这种机会不要错过。

One cannot afford to pass up this kind of opportunity should it present itself.

pèng dào hóng dēng shí yào tíng chē

碰到红灯时要停车。

You have to stop your car when you come to a red light.

nǐ kěn dìng cāi bù chū wǒ zài zhèn shang pèng dào shuí le

你肯定猜不出我在镇上碰到谁了。

You'll never guess who I met in town.

pèng dào kùn nan de shì

碰到困难的事

meet with difficulties