date: n.1.日期。2.时期；时代，年代。3.〔美口〕(和异性的)约会；〔美俚〕约会的对象。4.〔口语〕同日；本日。短语和例子make a date 定一个(会面的)日期。 She is his date. 她跟他有约会。 at an early date 日内。 bear date …载有(某某)年月日。 break [cut] the date 不遵守约会。 down to
Radioactive dating showed the crystals from western australia varied in age from 3 . 06billion to 4 . 25billion years ， making them almost 1billion years older than the previous oldest - knowndiamonds 放射性断代测出来自澳大利亚西部的这种晶体在30 . 6亿到42 . 5亿年前间发生变化，这比之前已知最古老的钻石还早10亿年左右。
