While approximately half of Americans buy at least one lottery ticket at some point, the vast majority of tickets are purchased by about 20 percent of the population.
尽管至少有一半美国人偶尔会买上一张彩票,绝大多数的彩票是由大约20%的人口所购买的。
According to the 2009-2010 National pet Owners Survey, 62% of U.S. households owned at least one pet in 2008, accounting for approximately 71 million households.
2009 - 2010年国家宠物主人调查问卷结果显示,2008年62%的美国家庭(也就是约7100百万家庭)至少养有一只宠物。
Consider, for example, the fungi, with approximately 100, 000 known species but by expert estimate at least 1.5 million species present in nature.
以真菌为例,其已知数量约为10万种,但生物学家估计,自然界中真菌的总数量至少为150万种。
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