There are three basic sources of monopoly.
垄断有三个来源。
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Water and land resources are the basic sources of human life and production.
水资源、土地资源是人类生活、生产的基本资料。
Stress comes from two basic sources: physical activity and mental or emotional activity.
压力一般来自两个方面：体力活动及精神或情感活动。
In this high-tech information age few look to the most basic industries as sources of national economic power.
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In other words, contentment and life satisfaction come from other sources once your basic needs are met.
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The basic and essential problem with most renewable energy sources is that their output is not continuous.
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