5 Tough Trucks

World Book's Learning Ladders Tough Trucks

世界图书的学习阶梯艰难的卡车

Bulldozer A bulldozer is the first truck to arrive at a construction site. This tough truck pushes huge piles of rocks and dirt out of the way. It clears the ground quickly, so people can build new roads and houses. A bulldozer's sharp prongs break up hard, rocky ground. Caterpillar tracks roll easily over the rocks and soil. The cab has thick windows to protect the driver from the noise of the clattering engine.

推土机是第一辆到达建筑工地的卡车。 这辆结实的卡车把成堆的岩石和泥土推开。 它很快清理了地面，所以人们可以建造新的道路和房屋。 推土机锋利的尖头能碾碎坚硬的岩石地面。 毛毛虫的足迹很容易在岩石和土壤上滚动。 驾驶室有厚厚的窗户，以保护司机免受发动机的轰鸣声。

Smoke from the engine puffs out of a long exhaust pipe. A metal blade pushes the heavy piles of rocks and dirt out of the way. It's a fact! This bulldozer works underwater! It is clearing a ditch so that pipes can be laid.

发动机的烟从长长的排气管里冒出来。 一把金属刀片将沉重的岩石和泥土推开。 这是事实!这台推土机在水下工作!它正在清理沟渠以便铺设管道。

Crane A crane lifts a heavy object high above your head. The crane can turn and reach and put the object in a different place. It can put a pipe into a deep hole or on top of a tall building! This crane is lifting a big pipe that is hanging from wires. A hook grips the wires firmly. A pipe is a heavy load. It's a fact! A crane lifts objects with its long arm. This crane's arm can stretch across a football field!

起重机将重物举过你的头顶。 起重机可以转动，到达并把物体放到不同的地方。 它可以把一根管子放进一个深洞里，或者放在一座高楼的顶部!这台起重机正在吊起一根挂在电线上的大管子。 钩子牢牢地钩住电线。 管道是很重的负荷。这是事实!起重机用它的长臂吊起物体。 这只起重机的臂能伸过一个足球场!

A crane's arm is called a boom. The boom can move up and down and from side to side, and it can stretch near or far. A crane driver works the boom. Giant feet, called jacks, stop the crane from toppling over. Tall cranes stand in a line at this busy port. They lift big boxes onto and off of ships.

起重机的臂称为吊杆。 吊杆可以上下移动，可以左右移动，可以伸长或伸长。 吊车司机在吊杆上工作。 巨大的脚，称为千斤顶，防止起重机倾倒。 在这个繁忙的港口，高大的起重机排成一行。 他们把大箱子从船上搬上搬下。