To make this a pull system, it needs a mechanism allowing the downstream process to somehow signal the upstream process to start working.

而为了使其变成拉动式系统，还需要一种机制来使下游工序以某种信号通知上游工序开始工作。

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Ambulances will digitally broadcast their out-of-my-way signal into cars ahead or even require them to automatically slow down and pull over.

救护车将其数字信号广播到前方的汽车网络中，甚至可以使它们自动减速并靠边。

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A metal band that wraps around the edges of the device is supposed to pull in a stronger signal; software is supposed to choose the section of the signal with the least congestion.

其机身周围的金属边是专门用来捕捉更强的信号。软件设计也支持自动选择最少堵塞的信号。

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Our goal is to use the high-def signal that they are broadcasting on Channel 10.1 to pull in ABCs HD signal.

ENGADGET: What if your cable provider doesn't have ABC in high-def? HD

There's only one problem: you can't seem to pull in a reliable OTA (over-the-air) signal.

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The pull-back into the 38.2% retracement zone from the highs on November 1 was our first signal that things were beginning to change again.

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