If we were to turn our back on Colombia by rejecting the free trade agreement, it would send a terrible signal to leaders willing to be courageous. It would send a bad signal to our friends.

如果我们背弃哥伦比亚，拒绝通过自由贸易协定，就会给那些本来勇敢无畏的领导人发出可怕的信号，给我们的盟友发出可怕的信号。

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If not, turn on your hazard warning lights or turn signal.

如果没有救助，打开你的危险警告灯或转向灯。

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This in turn left its mark on the polarization of the next photon, so amplifying the signal.

光子就这样轮流地将它的偏振标记留给下一个光子，因而增强了信号。

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A signal from the TV tells each side of the glasses when to turn on and off, showing each eye slightly different images that create the sense of depth.

VOA: special.2010.01.26

If the temperature drops below a certain level it sends a signal, 'turn on the heat', and that signal stays on until it gets a negative signal to turn off.

如果温度降到一定程度以下时,探测器会发送一个信号,打开加热器,直到加热器再收到关闭的信号,它就会一直开着

耶鲁公开课 - 生物医学工程探索课程节选

It also takes note of whether the bus' turn signal is on and can prepare a green turn arrow if the bus needs to head left or right.

FORBES: Magazine Article

If the driver puts on the turn signal anyway, the seat vibrates.

FORBES: Magazine Article

As an example, if a user draws a "W" on the dimmer, a signal could be sent to an IP connected water sprinkling system to turn on or off the sprinkler.

ENGADGET: Ube WiFi Smart Dimmer to receive customized multitouch gesture control