a position sensor for sensing if the work piece reaches target position, to send out signal;
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When TNFR is activated, it causes cells to send out signal molecules called chemokines that direct immune cells to the site of damage or infection.
当TNFR被激活以后，它使细胞释放出信号分子-化学增活素，化学增活素引导免疫细胞到达破坏或感染的位点。
CRF is a neurotransmitter, meaning it helps communicate signals between brain cells. Some neurons "send out" the CRF signal while others contain receptors to receive it.
CRF是一种神经传递介质，意味着它可以帮助脑细胞之间的信号传递，有些神经元“送出”CRF信号，而有些受体则会“接受”它。
I am actually relaxed with few things that have to be done.It is almost as if I send out a signal to her that I am ready for the challenge.
我对逃避不了的事情总是泰然处之，就好象我总在向女儿发出我整装待发的信号。
"One of the jobs of the president, whether you are named Bush or Obama, is to go out there and reassure people and to show you are in charge and to send a signal to potential enemies out there that this will not be tolerated by any American leader, and they did not project that power effectively,".
VOA: standard.2010.01.06
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