大概需要多久才到家呢？
假设您排在1号付款台前的长队中，您可以粗略地估算出大概需要多久时间才能排到自己付款。
Suppose you are in a long line at checkout counter 1 — you can roughly guess how long it would take to move up in that line.
你不需要知道这是多久之前的事，但我能给你一个大概时间---那时我还穿着喇叭裤呢。
You don't really want to know how long ago that was, but to give you a rough idea — I wrote it while wearing my bellbottoms.
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