Menstruation (a period) is a major stage of puberty in girls; it's one of the many physical signs that a girl is turning into a woman.

月经（例假）的来到是女孩青春期中经历的一个重要阶段；它是女孩变为女人的众多生理变化之一。

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The researchers also found an 81% drop in reports of both mental and physical fatigue over the same time period.

并且同一时期同时报告精神和身体疲劳的下降了81%。

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We who are your brothers and sisters from around the universe will come to the surface of your planet in physical form within this period.

我们，作为你们的来自宇宙各处的兄弟姐妹，将在这个时期以物质形态来到你们的地表。

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Rather, HFCS supporters argue that obesity is as much a function of a corresponding decline in physical activity during the same period that HFCS consumption increased.

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