I thought he wouldn't see Dave and me—his whole attention seemed focused on the recessional hymn.
我以为他不我和戴维,为他正全地听着退场赞美歌。
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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).
为了两个问题,首先必须知道两件事:某星系离我们有多远,它们在以多快远离我们而去(即现在所谓退行)。
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