Tiny qatar 's population trebled between 2000 and 2010 .

小小的卡塔尔在2000年至2010年间人口增长了三倍。

The same thing happened when fees trebled in 2006 .

2006年学费翻三倍时也发生过同样的情况。

Hunting was allowed again in 1975 , but the population has still trebled in the last 30 years and continues to grow at more than five per cent a year .

1975年再次允许捕猎雪雁，但在过去的30年中雪雁的数量增加了3倍，并且继续以年增长率超过5%的速度增长。

The main shanghai index has trebled in the past 18 months .

过去18个月，上证指数已增长两倍。

Its lending capacity is being trebled to $ 750 billion .

它的借贷能力已经增长了两倍，达到7500亿美元。