61 Building a House-Mid

Building a House FOCUS Question What kinds of work do people do when they build a house?

盖房子焦点问题人们盖房子的时候都做些什么工作?

From the Bottom Up Building a house is a lot of work. Work means using a force to make something move. A force can be a push or a pull. Workers begin with the floor. To make a strong floor, they push and pull a tool to move the wet concrete. This work uses a force.

建造一所房子是一项艰巨的工作。 做功意味着用一个力使某物移动。 力可以是推，也可以是拉。 工人们从地板开始。 为了制作坚固的地板，他们推拉一个工具来移动潮湿的混凝土。 这项工作要用到力。

Walls and a Roof Now the house needs walls and a roof. Workers use hammers to push nails into wood Hitting the nails uses a force Workers lift the walls onto the floor. Next, workers carry materials up ladders to build the roof. Climbing a ladder is also work. The workers push against each step with their feet to move up.

现在房子需要墙壁和屋顶。 工人们用锤子把钉子钉进木头里。击打钉子需要用力。工人们把墙抬到地板上。 接下来，工人们用梯子把材料搬上屋顶。 爬梯子也是工作。 工人们用脚顶着每一个台阶向上移动。

Electrical Power In many houses, wires carry electricity to outlets. Workers pull the wires to move them through the walls. Pulling wires uses a force. Air conditioners use electricity. Workers need help to push and pull the heavy machines into place. They need a crane for that work!

在许多房子里，电线把电输送到插座。 工人们拉着电线让它们穿过墙壁。 拉线需要用力。 空调用电。 工人们需要帮助来推动和拉动这些重型机器到位。 他们需要一台起重机来做那项工作!

Ceilings Workers push the ceiling into place. This is work. Then, they keep pushing so it will not fall. Holding it up takes a lot of force! But the ceiling does not move, so this is not work. Workers use plaster to make the ceiling smooth. They use a trowel to push and pull the plaster across the ceiling.

工人们把天花板推到位。 这是功。然后，他们继续推，这样它就不会掉下来。 把它举起来需要很大的力量!但是天花板不动，所以这不是功。 工人们用灰泥把天花板抹平。 他们用铲子在天花板上推拉灰泥。

Paint and Tile Workers paint the walls and ceiling with a roller or a brush. They push and pull to make the tools move Painting uses a force. Workers put tile or carpet on the floor. They push each tile into place. They pull the carpet toward the walls.

油漆和瓷砖工人用滚筒或刷子油漆墙壁和天花板。 他们推和拉，使工具移动绘画使用一个力。 工人们把瓷砖或地毯铺在地板上。 他们把每块瓷砖推到合适的位置。 他们把地毯拉向墙壁。