以下为句子列表:
英文: Obtaining redshifts is a practically foolproof technique for reconstructing cosmic history, but in the deepest of the deep-field images it is almost impossible to measure redshifts for all the galaxies.
中文: 其实利用红移来重建宇宙的历史是个直接而可靠的技巧,但在深视野影像的最深处,要测得所有星系的红移几乎是不可能的。
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