1. long thought to be an impossibly difficult operation; impossibly far from sources of supply. 
   一直都认为是一个很难做的手术；无法想象的供给缺乏。
2. With such a limited supply of fresh fruit, you won't be able to pick and choose. 
   新鲜水果供应很有限，没有什么挑拣余地。
3. By using all possible sources of clean energy supply through market mechanism, the diversification of energy supply will be promoted, and adequate and stable energy supply security system will be ensured. 
   要运用市场机制，利用各种途径供应各种清洁能源，推进优质能源供应多元化，并最终实现充足和稳定的供应。建立安全可靠的能源供应和保证系统。
4. control of pollution sources 
   污染源控制
5. sources of international law 
   国际法的渊源

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