患肥胖症的青少年人数增长速度更是惊人，在过去的四十几年中增加了2倍多。

Obesity among children is increasing at an even more alarming pace, having more than tripled in the past four decades.

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调查结果显示，1973年英国儿童患哮喘的比率为5.5%；1988年这一数字增至12%，是过去的2倍多；到了2003年，这一数字进一步增长到27.3%，几乎是1973年的5倍，增长速度惊人。

Back in 1973, a project survey showed that 5.5 percent of children had been diagnosed with asthma.

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无论是在内容方面还是在用户数量上它的增长速度是惊人的。

And it is growing with almost unbelievable impetus, both in content and in users.

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