The ultraviolet light could make it possible to determine how long ago oil had washed up in a given region, Kirby said.
Kirby说，紫外线能用来确定油污被冲到某一特定区域的时间。
Herbert-Read says the next stage of the research would be to find out how long ago in fish evolution these rules evolved.
赫伯特·里德说下一步的研究是找出在多久以前鱼类进化出了这些规则。
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.
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。
They can also tell how long ago the stellar bomb went off by measuring how much its light has been stretched to longer, redder wavelengths by the expansion of space.
通过测量空间膨胀把超新星的光波拉长了多少、变红了多少，天文学家们还可以判断出这种“宇宙炸弹”是多久以前发生爆炸的。
The trouble with tradition is that, no matter how long ago a story was made up, it is still exactly as true or untrue as the original story was.
传统存在的问题在于，不管这个故事创作了多久，它仍然像原始的故事一样真实或者虚假。
A statistical technique used in glottochronology; used to estimate how long ago different languages evolved from a common source language.
语言年代学中之一种统计技术；用来估计不同语言是在多少年前自同一源流进展下来的。
This means, among other things, that when biologists have calculated how long ago two lineages diverged by assuming change is regular, they may have their dates wrong.
这意味着先不考虑其他因素，若生物学家仅凭遗传变化具有规律性这一假设推算两个世系分化的时间，那么这种推算出来的时间可能就已经错了。
Having arrived I asked: 'How long ago was this house built?
到了之后，我问：“这房子是多久前盖的？”
Having arrived I asked: 'How long ago was this house built?
到了之后，我问：“这房子是多久前盖的？”
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