接口电路可以在没有连接信号地时工作，但将牺牲可靠性和抗扰度。

The interface circuit may operate without the signal ground connection, but may sacrifice reliability and noise immunity.

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传感器和信号地之间的共模电压VCM来自周围杂散电容耦合带来的噪声源。

VCM, the common-mode voltage between the sensor and the signal ground, results from nearby noise sources resulting from stray capacitive coupling.

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霍利在交通信号灯处不耐烦地等着信号改变。

Holly waited at a stoplight, impatient for the signal to change.

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They often involve the generation of what are called 'second messenger' molecules which carry the signal further into the cell.

过程中通常会生成一种叫做,第二信使的分子,将信号更深入地传递至细胞内部

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So even though they sent to your eyes, your brain has not developed to interprete these signals properly.

因此，即使投射到你的眼睛里去了，但是你的大脑并未发展到，能够正确地解释这些信号。

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So, in order to have fast transmission you do that by transmitting electrical signals; that happens pretty quickly.

所以 为了使信号迅速地传播,细胞使用电信号,它速度非常快

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