The reason reversing such gains is hard is that servicing this extra flesh means a person's maintenance diet creeps up with his weight—and so does his appetite.

恢复原来体重很困难的原因是，为增加的体重提供服务意味着一个人保持体能的饮食与其体重一起增加了，其胃口也增加了。

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This feature is extremely valuable for all applications, and especially regarding large machines, where sheer size and weight is a barrier to fast and cost effective servicing.

此功能是极其宝贵的所有应用，特别是关于大型机器，而纯粹的尺寸和重量是一个障碍，快速和具有成本效益的服务。

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