阐明了在浅沟发育初期、中期和后期三个发育阶段，沟头溯源侵蚀、沟壁扩展和沟床下切侵蚀变化规律。
The change of ephemeral gully headward erosion, gully-wall collapsing and deep-cutting erosion were quantified in the three stages of initial-phase, metaphase and anaphase.
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.
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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