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.
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.
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