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.
该玻璃钢材料可以代替金属板材制造货运火车的车厢箱体、轮船的外 壳船体。
The glass fiber reinforced plastic material can replace metal plates to produce the carriage body of a cargo train and the hull of a steamship.
给出了利用RP技术制造非金属原型的工艺流程，介绍了无模具熔模铸造箱体铸钢件的工艺过程。
The processing procedure of prototype making by rapid prototype and the production process of cast steel box without wax pattern in investment casting were described.
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