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.
公司坚持技术上的持续改进，管理上的不断完善；
Now we are improving and consummating our management and technology.
公司坚持技术上的持续改进，管理上的不断完善；
Now we are improving and consummating our management and technology.
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