通过测量星系光的红移，天文学家可以判断它在远离我们。

By measuring the ___redshift in a galaxy's light, astronomers can tell it's moving away from us.

晚上打开redshift功能后，屏幕的蓝光减少了很多。

After turning on ___redshift, the screen emits much less blue light in the evening.