词组 | while back |
释义 | while backadv.At a time several weeks or months in the past. — Used with a. 几个星期(或几个月)以前。——与a连用。◆ We had a good rain a while back, but we need more now.几个星期前我们这儿下过一场好雨,但现在我们需要更多的雨。 |
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