它说‘盔甲卫队’公司雇佣的450名保安人员中大约300人为廓尔喀人，其余由澳大利亚人、南非人和美国人混合组成。
It said about 300 of the 450 ArmorGroup guards are Gurkhas and the rest are a mix of Australians, South Africans and Americans.
比如说，当机场售票人员表现出不敬时，受挫的美国人越来越多地是提高嗓门，提出要求，而不是用礼貌而坚决的语气争辩。
Instead of arguing in a polite but firm manner with, say, airport ticketing agents, frustrated Americans increasingly raise their voices and make demands.
研究人员说，从1991年到1994年，12至19周岁美国人的平均血铅水平在0.015微克每毫升；1999年到2000年这一数字变为0.011微克。
The mean blood lead levels in the 12-to-19-year-olds were 1.5 micrograms per deciliter in 1991 to 1994 and 1.1 micrograms per deciliter from 1999 to 2000, researchers say.
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