有一种叫做沟槽的东西——一种用来阻止两面沟壁往下坍塌的金属容器——当你挖土超过5英尺(约1.52米)深时，用它来防止沟壁坍塌。

There's something called a trench box-a metal case that holds back the sides of the walls-used to stop the walls from 5 caving in when you dig deeper than 5ft.

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有一种叫做沟槽支撑的东西——一种用于挡住沟壁的金属箱体——挖土超过五英尺约1.5米时，用它来防止塌方。

There's something called a trench box - a metal case that holds back the sides of the walls - to be used to stop them caving in when you dig deeper than 5ft.

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本机床主要适用于高速钢、硬质合金及陶瓷刀具切削加工黑色金属、有色金属及部分非金属零件的内外圆柱面、内外圆锥面、沟槽、平面。

This series machine is suitable of ferrous, nonferrous metal and some kinds of non-metal materials with hard alloy, high capacity and high speed steel tools.

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