这些拖拉机正在田里拉着播种机工作。

The ___tractors are pulling seed drills in the field.

工人们用拖拉机将钢材运送到建筑工地。

Workers used ___tractors to transport steel beams to the construction site.

高速公路上挤满了运送货物的卡车和拖拉机。

The motorway was packed with trucks and ___tractors carrying goods.