In Chapter 2, we discussed phonetic features and natural classes.

第2章，我们讨论了语音特点和自然课。

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Forty students, selected from two natural classes by pair-sampling, were assigned to four groups, ten subjects for each group.

共有四十学生参加，他们是配对抽样从两自然班选出并被分成四组，每组十人。

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Two natural classes of first-grade students were involved, who entered the school in 2003. The results of the experiment are as follows.

在两年的教学实践研究中，选择大连商业学校的2003 年高一新生两个自然班作为实验因子。

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So, the classes of T-cells: macrophages, natural killer cells, these are a class of cells that's particularly important called dendritic cells.

这类T淋巴细胞包括巨噬细胞,自然杀伤细胞等 统称为树突细胞,树突细胞尤为重要

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Without boring you in academia, one of the assumptions in the theory suggests that companies and asset classes have a natural, repeating cycle in which good performance begets bad performance and vice-versa.

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With growing middle classes and a vast array of natural resources, the countries are also vulnerable in that they are still tied to the fates of other countries: China, which is also a competitor, and Brazil, which is more like a primus inter pares.

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So, a mismanaged country over time destroys most classes of assets-equities, real estate, even natural resources like oil production, but not gold.

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