按照对目前人口趋势的最保守估计，到那时人口将增加约30亿人。
Applying the most conservative estimates to current demographic trends, the human population will increase by about three billion people by then.
家庭农场里有很多这个世界上最保守的人。
Family farms are populated by some of the most conservative people in the world.
最保守的估计是载人飞船将增加10倍的费用。
The best estimate is that putting people on a spacecraft multiplies the cost ten-fold.
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