14. There is no point ( in ) doing …………没有用

　　There is no point in complaining; they never take notice.

　　埋怨也没用，人家根本不理睬。

　　15. There is no doubt that……毫无疑问……

　　No doubt

　　There is no doubt that he is the cleverest student I’ve ever taught.

　　毫无疑问他是我教过的最好的学生。

　　书面表达经典朗读素材

　　能的来源-Sources of EnergyNearly all energy comes from the sun, either in a roundabout① way or straight from it, in the form of heat rays and light rays. The light from the moon, too, comes from the sun. The moon can be said to be like a large mirror which throws back the sun's light to the earth.

　　Electrical energy comes from the sun in a roundabout way, e.g.②, it can come from the power of water falling down a mountainside③. The water fell there as rain, and we know that rain is made by the sun's heat evaporating the water on the earth's surface. This water vapour rises, condenses④ on cooling, and falls as rain.

　　The light and heat energy from coal also comes from the sun in a roundabout way. Coal was made by the rocks pressing on trees and plants which died millions of years ago. Those trees and plants grew with the aid of sunlight, from which they made carbohydrates⑤, in this way changing the sun's energy into chemical energy. When we burn coal, some of this energy is set free.

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