卫生习惯的重要性，是为了打击食品变质和食物中毒的微生物的扩散和活动。
The importance of sanitation practices is to combat the proliferation and activity of food spoilage and food poisoning microorganisms.
如果我们减少物种的数量，在一个王国内回收营养和能量，那末，病毒将肆意扩散蔓延，系统就会变质。
If we reduce the number of species, and recycle nutrients and energy within a kingdom, then viruses will thrive and the system will degenerate.
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