需要什么东西，你就按铃。

Just ring if you need anything.

总裁按铃叫秘书上来。

The President belled the secretary to come up.

他如此专心致志地读书以致没听见铃响。

He was so absorbed in a book that he did not hear the bell.

I hear, perhaps, the sounds of the cars outside my house, my alarm clock ringing, what have you.

我听到,轿车的声音从室外传来,或是闹钟的铃响,随你想象

This is your morning wake-up call.

这是你早上的闹铃。

And later on if you right before or right during you give the dog some food you--you ping a bell the bell will cause the saliva to come forth.

,在喂食前或者喂食过程中,你摇铃,铃声就会加速唾液的分泌。