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Life expectancy in ancient Rome was 20–30 years.

It is said that life expectancy in ancient Rome was 20–30 years.

Most medicines will be printed by 3-D printers in the future. -> It ...

It is widely agreed that most medicines will be printed by 3-D printers in the future.

Humans spend a third of their life sleeping. -> It ...

It has been calculated that a third of humans’ lives are spent sleeping.

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