The rats had been conditioned to ring a bell when they wanted food.
这些老鼠已经过训练，想吃食物时就会按铃。
THEY rarely ring a bell at the bottom of bear markets.
熊市的底部几乎总是悄无声息地来临。
Men can ring a bell to quit at any time, and two out of three do so.
如果不能忍受，可以随时摇铃退出，事实上三分之二的人会这样做。
这个名字是否让你想起点什么？
你听到过这个名字吗？
有没有帮你想起一些什么呢？
Sorry. That name doesn't ring a bell. It was so long ago.
很抱歉，我对那个名字没有印象，实在是太久了。
There is no sign on the door and you ring a bell to get in.
门上没有招牌，按门铃后，有人给你开门。
敲响警钟了？
敲响警钟了？
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