从优化准则中的查询引用表。
Learn to reference tables from the query in the optimization guideline.
从优化的角度来看，更为安全。
从优化产业结构和解决市场失灵问题的角度，提出了规避市场风险的方法和途径。
From the Angle of optimizing industry structure and solving market failure, we point out the means of market risk elusion.
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