我一发信号，你就跑！
我喊“一、二、三，开始！”作为你开始的信号。
I'll say 'One, two, three, go!' as a signal for you to start.
从该星系中心接收到的无线电信号证实了黑洞理论。
Radio signals received from the galaxy's centre back up the black hole theory.
毫无疑问，这是一个积极的信号。
但毫无疑问，这是一个积极的信号。
交警发出信号示意车辆缓慢前行。
光感受器是通过发出化学信号来对光作出反应的细胞。
Photoreceptors are cells that respond to light by sending out a chemical signal.
信号来了！
这是一个信号，表明人们对你所说的话感兴趣，想要听到你说的话。
It's a sign that people are interested and want to hear what you say.
从大黄蜂到校车，从交通信号到标记笔，这种高度可见的色调随处可见。
This highly visible hue is found on everything from bumblebees to school buses, traffic signs to highlighters.
那些预示着巨大变化即将到来的微弱信号或细微迹象，总是能被成功的领导者识别出来。
Great leaders recognize the weak signals or slight signs that point to big changes to come.
如果出了什么问题——比如，一只饥饿的蜥蜴在四处寻找蚂蚁作为零食——那么一群没有食物的蚂蚁就会匆匆归来，给等待的蚂蚁发出“不要出去”的信号。
If something goes wrong—a hungry lizard prowling around for an ant snack, for instance—then a rush of ants returning without food sends waiting reserves a "Don't go out" signal.
你把这理解为一个信号，而且是一个礼貌的信号，说明他对你这个人感兴趣，而不只是对谈话的话题感兴趣。
You interpret this as a sign—a polite one—that he is interested in you as a person rather than just in the topic of conversation.
通过将生物体与外部的周期信号完全隔离，生物学家了解到生物体有内部的生物钟。
By isolating organisms completely from external periodic cues, biologists learned that organisms have internal clocks.
响亮的喇叭声是国王驾到的信号。
他的继母发出无线电求救信号，他飞跑着去拿救生衣。
He raced to pick up the life jackets while his stepmother sent out a Mayday call.
它会发出很大声的求救信号，而它的兄弟姐妹会对此做出回应。
It will make a loud distress call, which its siblings answer.
信号员挥动着他受欢迎的小旗，火车司机愉快地鸣笛作为回答，火车驶出了车站。
The guard waved his welcome flag, the engine-driver whistled in cheerful response, and the train moved out of the station.
这艘船上的信号员用旗语向另一艘船发送好消息。
The signalman on the ship wigwagged the good news to the other ship.
还有其他一些令人鼓舞的信号。
现在已经有了一些积极的信号。
微笑是表示我们值得信任的一种信号。
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