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| 箱形掏槽在最初没有开口面的岩体上开挖的切口。箱形掏槽使切口两侧产生壁面,岩石将产生垂直方向和水平方面向上的膨胀 | |||
| 开挖槽; 箱形挖槽; 方形堑沟; 桶形掏槽 | |||
| box cut: 6 phrases in 2 subjects |
| Technology | 5 |
| Telecommunications | 1 |
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