他说他同事告诉他，为了让援救工作更加容易进行，需要用车厢残骸填泥泞的壕沟。
He said a colleague told him the wreckage was needed to fill in a muddy ditch to make rescue efforts easier.
带刺铁丝网围成的篱笆和一道宽宽的壕沟保护着这座越来越高的灰土堆成的小山，任何人试图接近这里都会引来大批警卫。
A barbed wire fence and a wide ditch protect the growing hill of ash: any attempt to approach brings the guards out in force.
杀人者将他扔进一条壕沟内，然后在他的身上埋上了一层薄土，试图掩藏他的尸体。
The killers threw him into a ditch and covered his body with a thin layer of soil in an attempt to hide the body.
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