As the largest energy market in the world, the energy prices of North America market always affect world oil price and are gradually becoming important reference indexes for natural gas pricing.
北美是世界最大的能源市场，其市场价格走向不仅影响全球石油价格，同时也逐渐成为世界天然气价格的重要参考指标。
The content of free proline, soluble protein, chlorophyll and relative water can be used as reference indexes.
游离脯氨酸含量、可溶性蛋白质含量、叶绿素含量和叶片相对含水量仅可作为参考指标。
Conclusion the overall density of mosquitoes, flies and rats was generally low, despite a few districts where the density exceeded reference indexes.
结论蚊、蝇、鼠密度除个别区、县较高，超出杀虫参考指标以外，总体密度较低。
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