Rock samples taken from the remains of an asteroid about twice the size of the 6-mile-wide asteroid that eradicated the dinosaurs have been dated to be 3.47 billion years old and thus are evidence of the earliest known asteroid impact on Earth.
语法 Sentence Correction-688
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正确的用户笔记
charlene123456 2015-10-19 11:25:18
date to 3.47 billion years ago date at 3.47billion years old
WinnieLee1 2015-12-18 14:44:33
date at 后面一般跟多少年old， date to 一般后面接一个时间点。 date at 3.47 billion years old date to 3.47 billion years ago
Charlotte0305 2015-06-23 22:17:08
date to 后面接一个具体的时间点，例句如下： Midwifery: art of attending women in childbirth. It is known to date to ancient biblical, greek, and roman times.助产术：看护产妇的技艺。可追溯至旧约圣经，希腊和罗马时代。 而date at后面跟的是年纪， date at ** years old
要拿第一名的神鱼 2017-01-17 18:31:41
dated to be ... ago(后面不用跟be 动词) dated at .... old
勋达令 2017-01-11 19:09:57
只有dated to +年份 +ago
sasazz 2016-09-26 11:41:12
date at 后面一般跟多少年old， date to 一般后面接一个时间点
meiyouyhm 2016-09-23 18:26:50
date to 3.47 billion years ago（date to +时间点） date at 3.47billion years old（date at+old）
shisu0610041 2016-09-16 18:31:55
date at 后面一般跟多少年old， date to 一般后面接一个时间点。 date at 3.47 billion years old date to 3.47 billion years ago
serene301 2016-09-15 01:02:07
to be
Suedy 2016-07-28 22:49:01
date to+时间点 date at+状态（years old）
fantasticW 2016-07-27 11:57:43
date at 后面一般跟多少年old， date to 一般后面接一个时间点。 date at 3.47 billion years old date to 3.47 billion years ago
托福必胜！！！ 2016-07-26 09:04:30
date at 后面一般跟多少年old， date to 一般后面接一个时间点。 date at 3.47 billion years old date to 3.47 billion years ago
TONITTO 2016-07-13 15:00:09
date to 3.47 billion years ago date at 3.47billion years old
