为了完善我国边防检查工作体系，应当建立海员证件分级评估制度。

In order to improve and perfect the frontier inspection system, we should build the graded estimation system of seamen's credentials.

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水产品分级评估和交易信用保障是制约网上渔市使之成功运营的两大重要因素。

There are two important elements in OFM operation which are rating of seafood and credit guarantee in trading.

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目的是探讨彩色多普勒静脉收缩术在评估二尖瓣反流分级中的作用。

The objective is to explore the roles of color Doppler vena contracta in the evaluation of mitral regurgitation grading.

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