We have discussed a lot about cities before.We have talked about the buildings in the city,construction vehicles in the city,Urban fire fighting...<br><div>Today, we are going to talk about a very important urban <b>facility</b>/ f??s?l?ti/ that is not very attractive.<br></div><div>Last time ,we have learned one important facility of city,that is Fire Extinguisher.And this time we are gonna learn another important facility of one city.Now let's look through these pictures,then you will know what it is.</div> <div>This is a manhole covers.Below the manhole cover,it's empty.It's the entrance of the drain.The manhole cover is to prevent someone from falling.</div><div><br></div><div>And this is the exit of the drain.</div><div><br></div><b>drain</b><div>a pipe that carries away dirty water or other liquid waste 下水道；排水管</div> Today we’re gonna make a very cool drain.But to make our drain we have many many pieces.<br>So now I’ll show you the pieces.Because they have different shapes.<br>So we have, this one is our straight pipe.So this pipe can go straight up and down or straight like this.But it can’t turn.<div>這個(gè)是直管, 這種管子可以直上直下或者像這樣直著用。但是不能轉(zhuǎn)彎。</div><div><br>So this is why we have this pipe.So if you want your pipe to turn left or turn right or turn up like this,you use this one.<br>所以這是為什么我們有這種管子。所以如果你想讓你的管子左轉(zhuǎn)或者右轉(zhuǎn)或者像這樣轉(zhuǎn)上去，你就可以用這個(gè)。<br><br>And we have this three-part pipe.So your pipe maybe will come, let’s see, like this come down，then you want to go right or you want to go left,you use this one.<br>我們還有這種三部分的管子。所以你的管子可以，我們看一下，像這樣下來(lái)，然后你可以讓它向右或者向左，就可以用這種。<br><br>But you see, now it still can’t go down.So that’s why we have our four-piece.Now you can go up, down, left or right.No problem.<br>但是你們看，它是沒(méi)辦法向下。所以這就是為什么我們有這種四個(gè)方向的管子?，F(xiàn)在你可以向上、向下、向左或者向右，都沒(méi)有問(wèn)題。<br><br>So we’ll use all these pieces today to make our pipe.And you can make it any shape you want, right?Yes, any shape is okay.<br><br>Now let's start our wonderful ideas.We're going to start building our own drainage / ?dre?n?d?/ system now.<br>So I wanna make the drain that can stand up.<br>So let’s see I will start with this three-part yellow one.<br>那么我們來(lái)看看，我要先用這個(gè)黃色的三頭的管子。<br><br>And we’ll just stick a couple of green ones in there like that.<br>我們要在上面按上兩個(gè)綠色的，像這樣<br><br>And then I want to give it some feet.So one there.One there.Now you see it can stand up.<br>然后我要給它一些小腳<br><br>Then we’re gonna have the pipe coming over like this.<br>然后我們要讓管子像這樣過(guò)來(lái)<br><br>I‘ll put a green one in there.And a yellow one on this side.OK. Now I’m just gonna turn it a little bit there.so you can see it better.<br>我要在這兒放一個(gè)綠色的。然后這邊放一個(gè)黃色的。好的，現(xiàn)在我要將它轉(zhuǎn)過(guò)來(lái)一點(diǎn)兒。這樣你們就可以更好的看到了。<br><br>So you see, we have our pipes going over the place.Looks pretty cool.<br>所以你們看，我們有向著各種方向的管子。<br></div> Now do you know why we have drains?<br>Well drains are very important,so you think about your sink at home.And you have your sink drain.If you turn on the water, and water is going into sink.And you have no drain the water will come up, up, up,and then the water will come out of the sink onto the floor everywhere.So the drain is to help the water go away.So this is what drains do.<br>And on the street you have the <b>sewer </b>/ ?su??(r)/ drain.If have a big rain is coming down,the rain water can go into the sewer drain.So the street people can drive their cars.<br>OK. So now I can show you how a drain works.<br>And you see I’ve got some water here.<br>So we made this water green so it’s easier to see.And I’m later gonna pour into our drain.<br>那么我們要，我們用的是綠色的水，這樣能更容易的看到。一會(huì)兒我要將它倒入我們的下水道里<br><br>We also have this picture.So this is a picture of the city.And you can use your scissors at home to cut a little hole here.<br>So this hole is your drain, OK?<br>我們還有這張圖片，這是一張城市的圖片。你們可以用剪刀將這兒的小洞剪下來(lái)。那么這個(gè)洞就是你的下水道，好嗎？<br><br>So you can see there is a line there.You just fold your picture like this.So now you have the city and then here is your hole.Then you’re gonna put that hole over on your pipes.Like this.<br>你們可以看到這兒有一道線(xiàn)，你可以像這樣折疊圖片，現(xiàn)在就有了城市，然后這兒是你的小洞，你可以將這個(gè)小洞放在你的一個(gè)管子上，像這樣<br><br>So now you can see all the buildings and the trees and then there is our drain.So now we’re gonna pour the water in here.And the water should come out to show you how the drain works.<br>OK you can see all the water is coming out the drain, and on the……<br>那么，現(xiàn)在你可以看到所有的建筑物和樹(shù)，然后這兒有我們的下水道，現(xiàn)在我要將水倒入這里，水應(yīng)該從下面出來(lái)，這樣你們就知道下水道是如何起作用的了。好的，你們可以看到所有的水都從下水道里出來(lái)了，然后在……<br><br>Yeah, it’s cool and on the city here only have a little water.Cause all the water went down the drain.OK so this is why we have drains to keep the city and everything from having too much water.<br>是的，很酷，在城市這里只有一點(diǎn)兒水,因?yàn)樗械乃剂飨氯?，進(jìn)了下水道了。好的，那么這就是為什么，我們要用下水道來(lái)讓城市和其他東西不會(huì)被水淹沒(méi)<div><br></div><div>So far，do you know why drains are very important for a city.</div><div>If there is no sewer drain, once there is a heavy rain, our city is likely to be flooded<br></div>