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Lesson 89 Clouds And Rain 第89课 云和雨 Each of us drinks about three pints of fresh water every day, and we use a great deal of water for washing, for cooking, and for other purposes. 我们每个人每一天都会饮用3品脱左右的淡水, 而...

When we change a liquid into vapour, and cool this vapour till it is liquid again, 将水加热成水蒸气, 然后对其进行冷却直至再次液化, we are said to distil the liquid, and the apparatus for doing this is called a still. 这个过程就...

Thus by heating liquids we cause them to evaporate, or change into vapours or gases; 因此, 可以看出：我们能够通过加热液体使得它们蒸发, 变成水蒸气或气体； and by taking away heat from these gases, or cooling them, we tu...

Lesson 88 Condensation 第88课 冷凝 When the water in a kettle boils, it boils first at the bottom. 当水壶中的水沸腾时, 首先开始沸腾的是底部的水。 We cannot see this in a kettle, because the kettle is made of iron. 我们无法...

These bristles point backwards. 这些刚毛朝向后方。 If we move a finger along the worm from the head to the tail, the body feels quite smooth; 用一根手指从蚯蚓的头部摸向其尾部, 就会感觉它的身体非常光滑； but if we...

Lesson 87 The Earth-worm 第87课 蚯蚓 The earth-worm is also called the dew-worm, because it likes to come out of its hole and creep about when the grass is wet with dew. 蚯蚓又叫露水虫, 因为当天气潮湿、小草上挂满露水时, 它就...

Each of the fixed stars is a sun, very much like our own sun, but so far away from the earth that it only looks like a speck of light. 每一颗恒星都是一个太阳, 与我们头顶上的那个太阳非常相似, 只是距离地球太远, 所以看...

Lesson 86 Sun, Moon, And Stars 第86课 太阳、月亮与星星 You know that everything which affects your senses is called matter, and that the earth is a great ball of matter. 你知道, 任何能够对你的感官造成影响的东西都叫做物质...

Some people like to make their cocoa by boiling the nibs in water. 有些人喜欢用水来煮可可粒, When this is done, a layer of cocoa-butter is formed on the top of the cocoa. 这样一来, 可可的上面就会形成一层可可脂。 But mos...

Lesson 85 Cocoa And Chocolate 第85课 可可与巧克力 You have all, no doubt, drunk a cup of cocoa, and you have also eaten part of a cocoanut. 毫无疑问, 你们肯定都喝过可可并且吃过巧克力。 Perhaps you thought that cocoa was m...