一听的用法和样例：
例句
-
我们一听说你病了，欢乐的气氛一扫而光。
It took all the fun out of the occasion when we heard that you were ill. -
我一听到好的立体声音乐就乐不可支。
Listening to a good stereo system always freaks me out. -
鸟群一听到枪声就四处飞散了。
The birds scattered at the sound of the gun. -
只剩下一听肉了。
There is only one can of meat left. -
他买了一听啤酒。
He bought a can of beer.
