重点讲解：
1. adhere to 遵守，遵循（规定或协议）；
We must adhere to the principle of making study serve the practical purpose.
我们必须坚持学以致用的原则。
2. on the basis of （行事的）理由，根据；
Statement should be made on the basis of fact.
说话要有根据。
3. refrain from 克制；忍住；
Can you refrain from laughter, my friends?
各位不要大笑，好吗？
4. account for （数量或比例上）占；
The minority nationalities account for six per cent of the population.
少数民族占人口的百分之六。