这不是因为身体在三十多岁时不可避免地会开始衰老，而是因为当女性达到三十来岁后，她们一般除了训练还有其它的责任。

This is not because bodies inevitably begin breaking down in their thirties, but because by the time women reach their thirties, they generally have responsibilities other than training for a sport.

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短跑运动员必须要具备较高的一般和专项身体训练水平，才能创造优异成绩。

Only after reaching a comparatively high level of both general and particular physical training can a sprinter create excellent results.

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一般而言，只有年龄在14岁以上，身体发育成熟的人才能经受住马拉松这种特殊的训练。

Generally speaking, participants in marathons should be above 14 years old and physically mature so they can endure the special training.

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