新加坡国立大学的统计数字显示，超过40%的学生在学期间被迫工作，而在放假期间，这一数字增加到90%。
NUS statistics show that over 40% of students are forced to work during term time and the figure increases to 90% during vacating periods.
统计数字显示，抽烟每年在全世界夺去了数百万人的生命。
Statistics show that smoking takes the lives of millions of people in the world every year.
一些估计数字显示，页岩气将美国天然气储量的可用期限延长了两倍以上，目前为超过100年。专家们表示，中国也有类似的潜力。
By some estimates, shale gas has more than tripled the lifespan of US gas reserves to more than 100 years and experts say there is similar potential in China.
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