Next, I like to add the basic sags to the skin.

下面，我想补充的基本凹陷的皮肤。

Analysis of voltage sags in distribution system.

配电系统电压跌落问题的分析。

The top shelf sags because the books are too heavy.

因为过于沉重，书架上的书凹了下来。

Sags in the coating. Can occur when objects are pre-heated.

涂层的流挂，尤其容易出现在预热的工件上。

That gives central bankers some room to cut if the world economy sags.

如果世界经济衰退的话，他们将有减少这个利率的空间。