I thought he wouldn't see Dave and me—his whole attention seemed focused on the recessional hymn.
以为他不会和戴维,为他正注地听着退场赞美歌。
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To answer both it is necessary to know two things: how far away certain galaxies are and how fast they are flying away from us (what is known as their recessional velocity).
了回答这两个问题,首先必须知道两件事:某星系有多远,它在以多快的速度远而去(即现在所谓的退行速度)。
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