If you want to fill a bag with sand, you have to control a kind of truck on wheels and move it into the correct place.
如果你想把一个袋子装满沙子，你必须控制一种有轮子的卡车，并把它移到正确的位置。
After the sand one, a big truck coming.
黄沙一片之后，一辆大卡车驶来。
The truck for removing sand on desert roads consists of sand pushing device, air blower, elevator and truck chassis.
沙漠公路清沙车由推沙装置、风力清沙装置、升降架和卡车底盘等组成。
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