铁路的红信号灯亮了，所以火车停下了。
①铁路的红信号灯亮了，所以火车停下了。
他们在8个的大型椭圆星系中发现了红矮星发出的微弱信号，这些星系离我们相对较近——它们的距离都在5千万到3亿光年之间。
They found faint signatures of these red dwarf stars in eight massive elliptical galaxies relatively close to us—between 50 million and 300 million light-years away.
信号灯由红转绿，她继续开车，拼命不去臆测强纳斯的死：克里斯-克劳夫特船在波涛汹涌的灰暗大西洋上左右摇摆。
The stoplight had changed to green. She drove on, trying desperately to keep her mind from speculating about his death: The Chris-Craft rocking unsteadily in the turbulent grayAtlantic .
成群结队的红尾蚺蟒、美洲巨蟒以及玉米锦蛇都蜷缩着躺在一张毛毯下面，等待着让它们加入到课程中来的信号，这就是当今推崇的“蛇瑜伽”健身课程。
Very real boa constrictors, pythons and corn snakes are laying curled up together under a blanket, waiting for their cue to join in the class.
等啊等，我左手边的车子都发动了，出于本能，我也跟着踩了油门，可问题是，我左手边的车是看到了左转信号灯绿了才发动的，而我的直行信号灯此刻依然是红的，而且非常红！
Thing is, while the cars to our left were reacting to a green arrow, allowing them to turn left, the light governing forward-moving traffic was still red. Very red.
信号线：如果我们持有做空的头寸，这条线应该是红的。
The Signal line: If we take short positions this line has to be red.
深圳市气象台所发布的黄、红、蓝色暴雨信号是历史上次数最多，最频繁之一。
Rain storm warning signals issued by Shenzhen Meteorological Observatory during that time were the most frequent in history.
交通信号灯采用红、黄、绿三种颜色，是因为早期的交通指挥官模仿铁路工程师所设计的用于铁道系统控制火车的编码系统。
Stoplights are red, yellow, and green, because traffic officials, early on copied the code system railroad engineers devised for track systems controlling the trains.
欧洲央行的特里谢表示：在欧元区财政稳定的风险信号正在飘红，因为债务危机的威胁已经影响到央行了。
Risk signals for financial stability in the euro area are flashing "red" as the debt crisis threatens to infect Banks, ECB's Trichet said.
彩色多普勒显示病变区呈蓝红相间的彩色血流信号，脉冲多普勒显示连续带状门脉血流频谱。
Pulsed Doppler spectra showed image of smooth continuous bands in the honeycomb or snaky black areas.
为什么交通信号灯采用红、黄、绿色？
每一方向都有红、黄、绿组成的交通信号灯。
Each direction has a red, yellow, green, composed of traffic lights.
每一方向都有红、黄、绿组成的交通信号灯。
Each direction has a red, yellow, green, composed of traffic lights.
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