触及

1. 水蒸汽触及冷的表面即凝结成水。
   Steam is condensed to water when it touches a cold surface.
2. 你要是提及这事，会触及他的痛处。
   If you mention this, you'll touch him on a tender spot.
3. 马修教授关于第四钢琴协奏曲的谈话没有触及什么关键性的问题。
   Professor Matthew's talk on the Fourth Piano Concerto was about nothing in particular.

及的英语翻译：