这样做是有意义的，因为底层协议提供很基本的服务，如网络电缆上的信号传输。
This makes sense, as the bottom protocols provide very basic services such as transmission of signals over network cables.
对于大多数现有的协议，你必须计算反弹的均值以尝试找到你真正想要的那个信号。
For most existing protocols, you have to average these bounces to try to find the signal you really want.
在这个问题上，一份气候改变的双边协议将会发出强烈的信号。
A bilateral deal on climate change would have sent a powerful signal on this subject.
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