运土的卡车正在疏浚狭窄被脏水填满的河，垃圾车一周来三次。
Earth-moving trucks are dredging the narrow, sewage-filled river, and garbage trucks pass through three times a week.
重型运土设备使用时，操作人员只能看到有限的区域，因此，必须指派矿口监工随时警告操作人员在操作位置上无法发现的危险。
It is, therefore, essential that a banksman be appointed to warn the operator of hazards that cannot be seen from the operator's position.
车上积了厚厚的一层土，看上去就像一辆运土车把满满一斗的土卸到了它的身上。
It was covered in so much dirt, it looked like a dump truck had backed up and deposited its payload on the roof.
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