质量体系运行是一个不断改进、完善和提高的过程。
The running of the quality system is a process that need improve, complete, raise.
我国高等级公路边坡防护的研究起步较晚，至今仍处于不断完善和改进当中。
Our study of highway slope protection start late and still is constantly refining and improving.
我国高等级公路边坡防护的研究起步较晚，至今仍处于不断完善和改进当中。
Our study of highway slope protection start late and still is constantly refining and improving.
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