It's quite simple: a PowerPoint presentation should have ten slides, last no more than twenty minutes, and contain no font smaller than thirty points.
非常简单：一次PowerPoint陈述，应该只有10页幻灯片，持续时间不超过20分钟，字体不小于30磅。
These families will be asked to pay no more than ten percent of their income for college.For example, a family earning one hundred twenty thousand dollars would pay about twelve thousand a year.
这些家庭只需支付不超过他们收入的10%的费用。例如，一个收入12万美金的家庭一年只需支付约一万二千元的费用。
There is no inherent benefit of subliminal advertising over regular advertising, any more than there would be in seeing a flash of a commercial instead of the full twenty seconds.
对比正式广告而言，阈下广告并无内在的优势，想想去看一个一闪而过的商业广告和将它看上20秒，到底谁更有效？
More than twenty chief clerks told him in different ways that they were sorry but that there were no vacancies.
其中，有二十多家招聘单位的主管以不同的方式回复他，“抱歉，目前没有空缺职位。”
Hotels range from very small, sometimes with no more than ten to twenty rooms to extremely large, luxury hotels with hundreds of rooms.
旅馆有从很小、有时不超过10 ~20个房间到非常大、非常豪华的拥有几百间客房的旅馆。
With every year these children from Mars will be born more and more on Earth. In our city there will be no fewer than twenty.
每年都有越来越多的火星孩子会降生到地球上，在我们的城市里就至少有20个。
With every year these children from Mars will be born more and more on Earth. In our city there will be no fewer than twenty.
每年都有越来越多的火星孩子会降生到地球上，在我们的城市里就至少有20个。
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