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date….at年代判定、鉴别/ 年份有….年之久，强调发生到现在经过的时间有多长 |
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G31-28 |
Rock samples taken from the remains of an asteroid about twice the size of the 6-nuke-wide asteroid that eradicated the dinosaurs have been dated at 3.47 billion years old and thus are evidence of the earliest known asteroid impact on Earth. |
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G13-28 |
Fossils of the arm of a sloth, found in Puerto Rico in 1991, have been dated at 34 million years old, making the sloth the earliest known mammal on the Greater Antilles islands. |
另外date在OG 之可见用法如下：
date back: have its origin
date from: to reckon计算/测量/认为/估计 from some point in time
