Behind the pillboxes were more lines of barbed wire and more trenches and dugouts reinforced with concrete to withstand artillery bombardment.

在这些机枪碉堡后方是更多的铁丝网、更多的壕沟，以及使用混凝土进行强化并能承受炮火轰击的掩蔽部。

youdao

A digger had be2en brought in to cut a path up the hill and carve out three trenches, each about 50 metres (160ft) long and more than 1.5 metres deep.

一台挖土机在山脚下了三个坑，每个坑有50米长1.5米深。

youdao

With the depth increasing, the effect of vibration reduction is improved and furthermore the vibration reduction by trenches is more fit for the high frequency vibration.

而隔振沟宽度和隔振沟位置对隔振沟减振效果影响不大；隔振沟对高频振动的减振效果尤为明显。

youdao

And my own conclusion after years of in-the-trenches management is that nothing is more important than feeling valued.

FORBES: The Joy Of Feeling Valued

Instead of just throwing more money at the problem of violence, the federal government is now in the trenches with communities and schools and law enforcement and faith-based institutions, with outstanding mayors like Mayor Nutter and Mayor Landrieu -- recognizing that we are stronger when we work together.

WHITEHOUSE: President Obama Speaks at the National Urban League Convention | The White House