少兒英語配音《楔子和螺絲》中英文對照課件配音文案

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5000207 Wedges and Screws
5000207楔子和螺絲
Mr. Douglas is making a wooden table and some chairs for the backyard with the help of some simple machines.
道格拉斯先生正在一些簡單機械的幫助下，為后院制作一張木制桌子和一些椅子。
Objective:
課程目標：
?In this topic we shall learn about the wedges and screws.
?在本課題下，我們將會學習楔子和螺絲。
Mr. Douglas is using a log to make the table. He needs to chop the log into smaller pieces. To cut the thick log of wood, he has to use a lot of effort force. To make it easier, he is now using a simple machine, the wedge. A wedge is basically an inclined plane. Wedges may have one or two sloping sides.
道格拉斯先生是使用原木做桌子的。他需要把原木劈成小塊。為了切割厚厚的原木，他不得不使用很多的作用力力。為了使其變得更加容易，他現在正在使用一個簡單機械-楔子。楔子從根本上來說是一個斜面。楔子可以有一個或兩個斜邊。
Now let us see how it works. With a knock of the hammer Mr. Douglas has pushed the wedge into the log. Notice, how the effort of pushing it in has caused a spreading force and split the log into two halves. This happens because the force of the hammer pounding on the flat end of the wedge drives the sharp end of the wedge deeper and deeper into the wood. Having cut the log, he needs to scrape off some of the uneven surface with a chisel. A chisel is also a type of wedge. It uses a forward driving force and turns it into a sideways force. The plank is now ready and so are the legs of the table. To assemble the table, Mr. Douglas is using screws. Look at the screw closely. It is an inclined plane wrapped around a cylinder. Like a wedge, a screw moves into the material. Look, after an initial tap on the head of the big screw Mr. Douglas is turning the screw. A screw turns a small rotational force into a larger forward driving force. He is also using some smaller screws to fix the leg properly. The inclined plane of a screw can be steep or shallow. That is, the threads can be far apart as in a big screw or close together as in a smaller screw. The difference is, the farther apart the threads, the faster a screw moves into a material with each turn, but it takes more effort. Looks like the table is almost ready and with this we conclude our lesson on wedges and screws.
現在讓我們看看它是如何工作的。達格拉斯先生通過使用錘子敲打把楔子推進原木中。注意，如何把楔子推進去的作用力會產生一個擴張力，并把原木分成兩半。這種情況的發生是因為錘子敲打楔子平坦末端的力讓楔子的尖端越來越深地打入到木頭中去。切割原木后，他需要使用鑿子把一些粗糙表面刮掉。鑿子也是一種楔子。它是利用向前的推動力，并把它變為側向力。現在，木板準備就緒了，桌子腿也準備好了。為了組裝桌子，達格拉斯先生使用了螺絲。近距離地觀看螺絲。它是一個纏繞著圓柱體的斜面。就像楔子一樣，螺絲也是運動進入材料中去的。看！在最初輕敲一下大螺絲的平頭后，達格拉斯先生在轉動螺絲。螺絲把較小的轉動力變為較大的向前推動力。他也使用一些較小的螺絲適當地固定桌腿。螺絲的斜面可以是很陡峭或很平緩。也就是說，螺紋可以離得很遠，就像是大螺絲中的螺紋，或者螺紋可以靠得很近，就像是較小螺絲中的螺紋。不同的是，螺紋離得越遠，每次轉動時螺絲進入材料中的速度越快，但是它需要更多的作用力。桌子看上去像是幾乎已經做好了，說完這個，我們就結束了我們關于楔子和螺絲的課程。
Summary:
總結：
?Wedge is a simple machine.
?楔子是一種簡單機械。
?It is a type of inclined plane.
?它是一種斜面。
?Wedges can be used to split things apart.
?楔子可以用來把物件分開。
?Screw is another simple machine.
?螺絲是另外一種簡單機械。
?The screw is also a type of inclined plane.
?螺絲也是一種斜面。
?A screw turns a small rotational force into a larger forward driving force.
?螺絲把較小的轉動力變為較大的向前推動力。

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