Why am I a guard rail for the bridge?

为什么我是桥的护栏？

Shelf with guard rail, adjustable in both height and depth.

搁板带有护栏，高度和宽度均可调节。

The lathe bed all around has the guard rail, safe reliable.

床身四周带有护栏，安全可靠。

At this average mil thickness, the yield of the guard rail paint increases.

在这样的平均密尔厚度下，栏杆涂料的产出效果就会增加。

The combined highway guard rail board can be used in a narrow central separation belt.

组合高速公路护栏板可在窄中央分隔带上使用。