这一点很重要，因为理论表明，当目标鱼种的生物量为其原始水平的50%左右时，渔场才能达到可收获的最大可持续产量。

That matters because theory suggests that the maximum sustainable yield that can be cropped from a fishery comes when the biomass of a target species is about 50% of its original levels.

youdao

他和他的团队发现，呼吸被污染的空气会使一个人的教育水平降低一年左右。

He and his team found that breathing polluted air can reduce a person's education level by about one year.

youdao

或者可能这说明了我们的左右脑分泌了不同水平的多巴胺？

Or maybe this is a reflection of our left and right brains spitting out different levels of dopamine?

youdao

So right now, it's something like 2% or it's a little bit higher last year, but maybe it'll be 2% going forward.

希勒有可能记错了08年2月份的美国通胀率为4%,略高于去年的水平,但未来应该会维持在2%左右

耶鲁公开课 - 金融市场课程节选

And what this is, is that if you want to take the section in French, you should have about an equivalent of 130, and the discussion's in French and a couple of the books-- I'll talk about them in a minute-- you can read in French, the others you read in English.

这个就是说,你要是想用法语授课,你的法语得有130分左右的水平,课堂讨论是用法语还有一些书,我马上要说到那些书 你可以看法语版的,其他人可以看英语版的

耶鲁公开课 - 1871年后的法国课程节选