另外，对于低等级公路路面结构，应着眼于在满足一定路用性能的前提下，降低造价水平。

In addition, emphasis is laid on reducing cost under the precondition that adequate performance can be met.

实行建设工程项目监理制度，对提高工程质量、优化工期、降低造价，提高工程建设的总体效益有着重要的意义。

It is very significant to implement Project Supervision System for improving Project Quality, optimizing Project Time Limit, reducing costs and improving overall Project Performances.