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。
心理过程的价值在于它对生命的服务。
The whole is other than the sum of the parts.
The great secret that all old people share is that you really haven't changed in seventy or eighty years. Your body changes, but you don't change at all. And that, of course, causes great confusion.