Economists have long studied how institutional constraints interfere with efficient economic choices, such as when special interests erect barriers to entry in product markets.
经济学家长期研究制度约束对有效经济选择的干涉，比如当特别的利率突破屏障进入产品市场的时候。
This ape-man could walk erect, make and use simple tools and knew how to use fire.
这种猿人能够直立行走，打制和使用简单工具，并且知道如何使用火。
This ape-man could walk erect, make and use simple tools and knew how to use fire.
这种猿人能够直立行走，打制和使用简单工具，并且知道如何使用火。
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