Medical merchandising enterprises, as a important section of medical industry, connect two links of production and consumption, and play the indispensable role in medical circulation market.
医药商业企业作为医药行业的重要组成部分，连接着医药生产和消费终端两个环节，是医药流通市场中不可或缺的角色。
When operated, the circulation sub allows a higher circulation rate to be established by opening a path to the annulus in the top section of the tool string.
循环接头在工作时在工具管柱的上段打开通向环形空间的通路，于是能够建立较大的循环流量。
Water level difference crossing Lianhuatang section reduced by circulation flow is one of the most important problem in flood control.
弯道环流形成的城陵矶河段莲花塘断面横向水位落差是防洪中非常关心的问题之一。
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