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.
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-used to stop the walls from 5 caving in when you dig deeper than 5ft.
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。
Then the impacts of metal case size on the input impedances and patterns of antennas are discussed with the moment method.
进而结合实际的天线结构，运用矩量法计算了金属盒大小对天线阻抗和方向图的影响。
Then the impacts of metal case size on the input impedances and patterns of antennas are discussed with the moment method.
进而结合实际的天线结构，运用矩量法计算了金属盒大小对天线阻抗和方向图的影响。
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