单词：Hubble effect
Hubble effect的用法和样例：
例句
- This effect, known as gravitational redshift, is not specific to black holes.这种称做重力红移的效应，并不是黑洞所特有。
- The redshift caused by the expansion is often confused with the more familiar redshift generated by the Doppler effect.膨胀所造成的红移，常会和我们比较熟悉的都卜勒效应所产生的红移搞混。
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