伊朗是世界主要原油生产国之一，但缺乏提炼设施，迫使伊朗进口汽油和其他成品油。
Iran is one of the world's largest crude-oil producers, but has an inadequate refining capacity that forces it to import useful petroleum products.
作者称，伴随着生物原料转变成塑料成品的整个过程，这些影响主要来自于化肥，杀虫剂的使用以及退地还耕的举措。
These impacts came largely from fertilizer use, pesticide use and conversion of lands to agricultural fields, along with processing the bio-feedstocks into plastics, the authors reported.
他们抱怨道，中国国内市场的贸易壁垒使得印度主要出口未精制的材料和初级产品，得到的是制成品。
They complain that barriers to China's domestic market mean that India is mostly shipping unrefined minerals and primary goods, getting finished products in return.
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