They stop at a door and speak quietly.

(他们在一扇门前停下,小声说话. )

The answer is that you should speak quietly and smile a lot.

答案是你必须小声说话并且经常微笑。

Please speak quietly in the library.

在图书馆里请轻声地讲话。

Please speak quietly. Do not shout/yell.

请小声点，不要喊。

To speak quietly and privately, as by way of gossip , slander, or intrigue.

私语''.'暗中'.''秘密地及私下里说, 如通过说闲话 、 诽谤或搞阴谋''.'的'. ''方式.

We cannot learn from one another until we stop shouting at one another until we speak quietly enough so that our words can be heard as well as our voices.

我们彼此之间应停止吵吵闹闹，我们要心平气和地相互对话，这样才能使对方不仅听清我们的声音，而且理解我们的言辞，否则，我们根本就不可能相互学习。