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1·一班有50名学生。
There are 50 students in Class 1.
2·2007年美国有九千四百一十万blog读者(占互联网用户的50%)。
1 million us blog readers in 2007 (50% of Internet users).
3·他告诉卫报记者，如果可以在撒哈拉以南非洲地区实施该方案，不到50年的时间，艾滋病病毒携带者的比例将减少到1 %以下。
If this could be implemented in sub-Saharan Africa, he told the Guardian, "the proportion of people with HIV would run to under 1% in less than 50 years".
4·这个标签引起一个自动进度工具条每50毫秒移动1%。
This tag creates an automatic progress bar that moves by 1% every 50 ms.
5·将参数最大行数从50修改为1，这对于测试来说已经足够了。
Change the parameter Max Rows from 50 to 1, which is sufficient for testing.
6·人们在程序中搜索出并牢牢记住它的赔率：1赔50.
The crowd rummaged in their programmes to remember the odds: 50 to 1.
7·雾气中的水滴极小，通常在1 - 50微米(一百万分之一米)之间。
Water droplets in fog are very small, typically between 1 to 50 microns (one-millionth of a metre) across.
8·比如，一个国家有两种关税，一种征收100%关税，另一种则仅仅征收1%的关税，如果只把低关税去除，就会出现关税50%平均减免的效果。
For example, a country with two tariffs, one at 100% and another at just 1%, can deliver a 50% average cut by removing the trivial tariff entirely (a 100% cut), and leaving the other untouched.
9·每50人中约有1人因为第一次手术后遗留下来的问题，需要进行第二次手术。
About 1 in 50 people who have weight-loss surgery need a second operation because of problems after their first operation.
10·锂盐药物在1970年获得美国食品药品管理局（FDA）最初批准时，还被认为可能导致服药的母亲生下心脏瓣膜缺损的婴儿，而且所谓的比例还非常高（约为1/50）。
When it was first approved by the FDA in 1970, lithium was believed to cause heart-valve defects in an extremely high percentage of infants born to mothers who were on the drug (about 1 in 50).