Natural weight gain and other changes caused by puberty.

发育期所带来的体重自然增加以及其它变化。

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Exposure to those chemicals, said Baillie-Hamilton, can damage the body's natural weight-control mechanisms.

Baillie - Hamilton称，接触了某些化学制品，会损害人体天然的体重调节机制。

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Someone might weigh 60-69kg without too much effort. But going above or below the natural weight range is difficult.

有些人可能在顺其自然的条件下就保持60到69公斤的体重，但是减轻或者增加体重却是比较困难的。

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Riding at nearly two stone below his natural weight, McCoy spends up to 12 hours a week sweating in baths and saunas to ensure he reaches the correct weight.

BBC: Jockey McCoy 'humbled' by Sports Personality award

To see how the FN can punch above its weight beyond its natural strongholds, take a closer look at Marine Le Pen's foot soldiers in Rochefort.

BBC: French far-right leader Le Pen looks west for votes

Then, whether natural or artificial, the full weight of synthetic biology can be brought to bear on the problem.

ECONOMIST: Synthetic biology