真21比气动调节继电器信号室力臂，即输出的压力信号的压力比是无限可调。
The Model 21 Adjustable Ratio pneumatic relay has a signal chamber lever arm, whereby the ratio of output pressure to signal pressure is infinitely adjustable.
iPhone的信号强度需要在消声室中进行。
An anechoic chamber is used to test the iPhone's signal strength.
在实验室器皿中，人们看到这些细胞发出信号，并与其它神经细胞联系。
In the laboratory dish, the cells were seen to signal and make connections with other nerve cells.
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