退废，读音tuì fèi，汉语词语，意思是黜退不用。
由于没有重力施加于身体上，骨骼和肌肉都会废退。
With no gravity exerting itself on the body, both bones and muscles begin to waste.
但不论细节如何，这种“用进废退”的情形显然确凿无疑。
Regardless of the details, though, this would appear to be a clear case of "use it or lose it".
脑运动有：用进废退、适度用脑、整体开发、身心互动和脑体交替等规律。
The principle of brain movement have: Progress on use and retarding on waste, moderate use integral exploit, physical and mental alternation.
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