It's growing very, very quickly, much faster than the world average.

变化非常迅速，比世界平均速度更快。

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If even the dieticians can't do it accurately what in the world is the average going to do?

如果连营养学家们都无法精确估算,那么普通人究竟该如何去做啊

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Americans spend the most time out of any other people in the world volunteering in average four hours a week, volunteering outside their job which may also have a social objective more than any other people in the world.

比其他任何人所花的时间都多,平均每周有四个小时做志愿者的工作，做与自身工作无关的善事,他们比世界上其他人更具社会目标。

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