I squashed him with a sarcastic remark.
说
一句讽刺的话把他给

。
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When light is emitted by a distant star or galaxy, its wavelength doesn't have to stay fixed, it can be squashed or stretched, and when light's stretched, its wavelength increases and it moves to the red end of the spectrum.
来自遥远的恒星或星系的光,它的波长并非一成不变,而是会被压缩或者拉伸的,当光波被拉伸时,波长会增加,于是朝光谱上的红色方向移动。
总)