有一个小的气口可以让微波进出，但它至少应该能大幅度限制信号。
There is a small gap for waves to escape, but it should at least dramatically limit the signal.
在给定信号强度和噪声水平的情况下，以比特每秒为单位给出的最终限制是无差错通信的最大绝对速率。
The resulting limit, given in units of bits per second, is the absolute maximum rate of error-free communication given signal strength and noise level.
过去的月震研究最主要的限制就是去除噪声，这些噪声由迭加信号在月球的分馏地壳结构中反复反射引起。
A primary limitation to past lunar seismic studies was the wash of'noise' caused by overlapping signals bouncing repeatedly offstructures in the Moon’s fractionated crust.
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