pipeline trench造句

Now suppose someone built a pipeline and willfully ignored all the rules _ leaving large rocks in the pipeline trench, say, increasing the chance of rupture.
They are to admit, the lawyer said, that they neglected to assure that all promised trench breakers were installed along slopes and that clay " plugs " were placed at the edges of wetlands to prevent water escaping into the pipeline trench.
It's difficult to find pipeline trench in a sentence. 用pipeline trench造句挺难的