But even if we focus on the bottom 10 percent or 20 percent of Americans, it would still be difficult to identify who the poor are, because the composition of this group changes constantly.

但即使我们目光放在最底层的10%或20%美国人身上，我们也还是很难辨认出谁才是真正的穷人，因为这个群体的构成是经常变动的。

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Actors constitute the largest voting bloc, numbering 1, 311 members (22 percent) of the Academy's composition.

演员在可投票的会员中的比例最大，共有1311名，占总数的22%。

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From the audience composition, the children's television programmes face a viewership of more than 30 percent of the groups audience.

从观众构成来看，儿童电视节目面对的是占收视群体30%以上的观众。

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On January 29th of 2008 you'll have two states, South Carolina, that will be approximately 50 percent African-American in the composition of the Democratic primary, and Florida, which will be about 25 percent.

NPR: Presidential Candidates Target Black Music Festival

New order composition was: foundry 72 percent, logic and other 12 percent, flash 12 percent, and DRAM 4 percent.

FORBES: Applied Materials FY Q2 Tops Street Estimates

On average, the composition of Holstein milk is 87.7 percent water, 3.7 percent milk fat and 8.6 percent skim solids.

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