Wi-Fi采用的是先听后说(listen-before-talk，简称LBT)的机制，即希望使用该频段的任何设备必须先听，看此频段是否被占用。如果此频段不繁忙，设备就可以占用并开始传输。
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... listen-before-talk 称听后讲 talk-listen button 通话按钮; 通话按纽 talk-listen key 发送接收电键 ...
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Barratt指出，在先听后送(listen-before-talk)的模式下，LTE能支持降级(fallback)的蜂巢式通讯服务，而这正是Wi-Fi技术缺乏的；旧有的Wi-Fi网络不支持先听后送，两种网络的占空...
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Talk to people whom you have never talked to before, and really listen.
和你从未说过话的人交谈，并认真倾听。
It's important to listen as much, if not more than, you talk; think about what you want to say before it comes out of your mouth; understand that everyone is human and makes mistakes.
多倾听很重要，否则的话你就会多说；三思而后言；要理解大家都是常人，孰人无过。
Talk with people you have never talked with before, and this time listen sincerely.
去跟那些你从未曾交谈过的人聊聊，并且这次要认真的倾听。
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