The latest post office machines can sort letters at 30,000 items an hour, which is much faster than manual sorting.

邮局的最新机器每小时可以分拣3万份邮件，大大快于手工分拣。

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Manual sorting is expensive in the rich world, which is why recyclables are often shipped to places with low labour costs.

正因为人工分类整理在富裕国家是很昂贵的，所以回收品才经常会被运到劳动力价格低的地方去。

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If you have finance skills and plan to volunteer at a soup kitchen, he says, one hour of your time is worth significantly more for the organization if you spend it helping with budgeting rather than doing a manual task like sorting cans.

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Bank sorting equipment ejected the demagnified check for slower manual processing, gaining the boys extra days of float.

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