研究人员说，最佳水平范围是每毫升30到40纳克。

Optimal levels range from 30 nanograms per milliliter to 40 nanograms per milliliter, the researchers said.

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哪些水平范围很大可以引起结果发生改变，但是结果依然可测量？

What levels are wide enough apart to induce a change to the response, but still make a measurable result?

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弹出汉语：这个天才的团队教授水平范围广泛，但是其他语种在线网站比较少。

Popup Chinese: This talented team teaches a wide range of levels, but has a niche that few other online language sites offer, preparation for the standardized Chinese language test known as HSK.

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Because you'll have an appropriate level of confidence and competence in your ability to do computational problem solving.

因为你们在自己的能力范围内,拥有应对解决计算问题的,正当水平的自信心和竞争力。

麻省理工公开课 - 计算机科学及编程导论课程节选

But if we have credit markets, then people can individually choose to be off the production possibility frontier and at a higher level of consumption than otherwise would.

但如果存在信贷市场,那么个人可以选择超越,PPF曲线的范围,达到比没有信贷市场时更高的消费水平

耶鲁公开课 - 金融市场课程节选