Here is a study on the effects of the composition and amount of the reprocessed raw material from building waste on the physical and mechanical performances of recycled concrete.

研究了建筑垃圾再生原料的组成与用量对再生混凝土物理力学性能的影响。

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The major point to keep in mind is that, while weight is important, it is not a total reflection of your body composition such as the amount of body fat and/or muscle that you have.

你要谨记，尽管体重很重要，但它无法完全反映机体的组成，如身体脂肪和/或肌肉含量。

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By changing the composition of the semiconductor materials, it is possible to determine the amount of energy given up by each electron, and hence the light's colour.

改变半导体材料的构成可以改变电子能量释放的多少，从而改变光的颜色。

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The company's vice president, William Weimer, says the M-88s are legal to purchase by consumers because they have a limited amount of pyrotechnic composition and are not very strong.

CNN: By the CNN Wire Staff

Weather is caused by disturbances within the atmosphere, but climate is controlled by external influences, such as the distribution of oceans and continents, the extent of ice and snow-cover, variations in the amount of energy from the sun, and changes in the chemical composition of the atmosphere.

BBC: Time to spend more money preparing for colder winters?