The moment you think you've understood a character completely is the moment you've lost them.
Mathematics is the art of asking the right questions and then finding their answers.
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。
我们对显而易见的事物视而不见,而且对自己的视而不见也视而不见。