In pre-stressed concrete, the steel

In pre-stressed concrete, the steel is stretched and securely anchored within its mould box before the concrete is placed.

Results (Chinese) 1:

在预应力混凝土、 钢拉伸和固定在其模具框内放入混凝土之前。

Results (Chinese) 2:

在预应力混凝土，钢被拉伸并牢固地放置在混凝土之前其模盒内锚定。

Results (Chinese) 3:

在预应力混凝土中，钢被拉长，并在其模具箱内牢固地固定在混凝土被放置之前。