减肥药的原理是刺激中枢神经以压抑食欲，从而减少进食，达至减肥效果。
The principle of medicine reducing weight is to stimulate the central nervous to suppress appetite, thus reduce eating, reaches to the result reducing weight.
它之所以被定义为一种药物，是因为它会刺激中枢神经系统，让人神智更加清醒。
Caffeine is defined as a drug because it stimulates the central nervous system, causing increased alertness.
制得阿托品和其他合成物质也可以刺激中枢神经系统，其中阿托品几乎可以完全被肾脏排净，而肾脏在药物吸收过程中又是至关重要的。
Atropine and various synthetic substances also stimulate the central nervous system. Atropine is eliminated almost entirely by the kidneys, which must be working normally in order to process the drug.
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