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- 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.
- 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.
- 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.
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