There are three basic sources of monopoly.
垄断有三个来源。
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。
We rely on the same basic energy sources.
我们依靠相同的基本能源。
These include healthcare, schools, alternative energy sources, and medical and basic research.
这些产业包括医疗保健、学校教育、替代能源和基础医疗研究。
These include healthcare, schools, alternative energy sources, and medical and basic research.
这些产业包括医疗保健、学校教育、替代能源和基础医疗研究。
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