鲍勃累极了，一碰到枕头就睡着了。
Bob was so tired that he fell asleep the moment his head touched the pillow.
不要一碰到麻烦就强调工作中的困难。
Don't stress the difficulties in work whenever you meet with trouble.
他的头一碰到枕头就睡着了。
看这里，我一碰到您的牙龈就有好几处出血。
Look here. Your gums bleed in some places when I touch them.
我们一碰到困难，这位老教授就来帮助我们。
Every time we had difficulties, the old professor would come to help.
不用说，他一碰到冷冰冰的河水，一下子就清醒了。
Needless to say, he sobered up pretty quickly once he hit the icy water.
不用说，他一碰到冷冰冰的河水，一下子就清醒了。
Needless to say, he sobered up pretty quickly once he hit the icy water.
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