柴油发动机可以使用植物油作为燃料,这将极大地促进使用该技术的国家的农业发展。
There are no hard distinctions between what is real and what is unreal, nor between what is true and what is false.
唯一受过教育的人是学会了如何学习和改变的人。
不要小看孩子,他们比我们想象的要聪明得多。
If you don't like something, change it. If you can't change it, change your attitude.