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In the lungs the blood gets from the air-tubes the oxygen which it needs, 肺部的血液从气管中获取所需的氧气, and the air takes from the blood hurtful things which it must get rid of, and which we breathe out with our breath. 而空气则...

Lesson 97 The Body 第97课 人体 If you wish to keep your body healthy, you must learn something about its inside as well as about its outside. 你想要有一个健康的身体, 那就不仅需要了解它的外部结构, 更要明白它的内在构...

In a few years more the milk-teeth begin to go. 几年之后, 乳牙开始掉落。 Another set of teeth, called the permanent teeth, is growing, one under each of the milk-teeth, and pushing out the first set. 另一套牙齿从原来的位置上长出...

Lesson 96 The Body 第96课 人体 This Lesson is going to be about our own selvesabout our bodies. 这篇文章讲述的是我们自己人体。 Every one wants to have a nice-looking and healthy body, which will live a long time. 谁都希望自己拥...

Of what use is flour? Every child knows that it is made into bread and puddings and pastry. 面粉有什么用处呢? 孩子们都知道, 面粉可以用来制作面包、布丁与糕点。 To make bread, we must mix the flour with some water, to whi...

This powder has to be sifted, to separate the husks from the flour. 然后, 人们利用筛子将面粉与外皮分离。 The husks are hard and coarse, and they would not be good food for us, for we could not digest them. 外皮坚硬且粗糙, 我们...

Lesson 95 Flour And Bread 第95课 面粉与面包 Let us buy a pound of flour at the baker's. 我们去面包房买上一磅面粉。 The baker will give us the flour in a nice paper bag, and it will only cost about twopence. 他们会将面粉装在精...

for when you shut the bellows, the valve cannot close the air-hole because of your finger, 因为, 当你关闭风箱把手时, 你的手指使得阀门无法关闭空气进出的圆孔, and most of the air then escapes through this hole instead of g...

Lesson 94 A Pair Of Bellows 第94课 一副风箱 Have you a pair of bellows at home? 你的家里是否有一副风箱呢? If you have, I hope that you will examine them carefully, and try to see how they are made, and to understand their use. 如果有...

The tongue of the frog is most useful to the creature in catching the flies and other small insects on which it feeds. 青蛙的舌头非常有用, 就是依靠它来捕食苍蝇与其他小型昆虫。 It is joined to the lower jaw in front, and not...