遇见；出现to bump into; to meet with

• 我没有碰到他。

  I didn't bump into him.

• 工作上碰到了困难

  met with a difficulty at work

• 碰到这种机会不要错过。

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

• 碰到什么算什么

  take things as they come