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.
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！
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.
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.
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。
然而，两国关系见好的信号是显而易见的。
Signs of softening between the two countries are, however, evident.
关注别人非言语信号的同时不要忽视自己。
All the while you're reading your partner's nonverbal signals, be aware of your own.
我们用更精巧的方法继续聆听外星人发出的信号。
So we continue to listen out for the signal from aliens through ever more ingenious methods.
新的生物传感器芯片可实现心电信号的远程采集。
该频段的信号可以穿透墙壁，从而非常适合无线宽带。
Signals in the spectrum can penetrate walls, making it ideal for wireless broadband.
然而，即使在这些困难的时候，还是有一些正面的信号。
And yet, even in these grim times, there are some positive signs.
每一个闪烁模式都是帮助萤火虫发现潜在配偶的光信号。
Each blinking pattern is an optical signal that helps fireflies find potential mates.
制造方面的突破随后为更远距离的光纤信号传输铺平了道路。
Manufacturing breakthroughs then opened the way for moving signals over far greater distances.
当然，还是有些积极的信号表明奥巴马的提议并未完全落空。
But there were a few positive signs that Obama's offer was not made in vain.
在最近几个月里，我们在这方面看到了一些鼓舞人心的信号。
In recent months, we've seen encouraging signs on that front.
相信此访将推进两国各领域的合作，发出强有力的积极信号。
He said he believed that the visit would boost cooperation between the two countries in various fields and send a strong positive signal.
大多数雇主希望收到的信号是这个人有条理、友善、高效。
The message that most employers will hope to receive is one of organised, sociable efficiency.
这些神经细胞通过脊髓向肌肉发送信号，使我们具备运动的能力。
These send signals through the spinal cord to the muscles to give us the ability to move.
幸运的是，在Android上你不必相信手机的信号条。
突然，从两座城堡之一传来了号角声——正是开饭的信号。
Suddenly a trumpet sounded from one of the castles, to announce that mealtime was approaching.
作为一名儿科医师，我知道发烧是身体免疫系统运行良好的一个信号。
As a pediatrician, I know fever is a signal that the immune system is working well.
一个大学文凭不单单是对你知识的证明，而且是一个学习能力的信号。
A university education serves not just to educate, but also to signal the ability to learn.
一个大学文凭不单单是对你知识的证明，而且是一个学习能力的信号。
A university education serves not just to educate, but also to signal the ability to learn.
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