They dig trench to keep the forest fire from spread.

他们挖沟以阻止森林大火蔓延。

youdao

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。

youdao

Trench warfare is resorted to when the superior firepower of the defense compels the opposing forces to "dig in" so extensively as to sacrifice their mobility in order to gain protection.

当防守方的优势火力迫使敌方广泛“掘壕”，以牺牲机动性来获得防护力时，就会发生堑壕战。

youdao

When he met The Economist, Mr Islamov was raising money for a friend from Tajikstan who had been forced to dig a trench on the coldest day of January.

ECONOMIST: What the snows of Moscow reveal about modern Russia

To raise tax rates on anyone or to continue our regulatory ways will only dig a deeper trench around the boulder that is our economy.

FORBES: The Bush Tax Rates Are Too High To Move This Boulder

If the snow is the right kind (hard and old but not too old), you can dig out a cave or a trench, or even carve out blocks of snow with a ski-pole, machete or a stick.

WSJ: Sam Sheridan's Apocalypse Tips, Antibiotics to Zombies