据保守估计，有3千万中国小孩正在学习钢琴。
On one (conservative) estimate, 30m Chinese children are learning to play the piano.
据保守估计，气候变化每年将会给贫困国家造成数百亿美元的损失。
Coping with climate change will cost poor countries tens of billions of dollars a year by most reckonings.
据保守估计，每年约有五十万人死于与小型武器相关的谋杀、自杀、家庭暴力和武装冲突。
Conservative estimates suggest that over half a million lives are lost to small arms every year through homicide, suicide, domestic violence, and armed conflict.
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