随机实验是因果推理的黄金标准,但它们并不总是可行的。
未来能源存储的关键在于新材料和创新技术的发展。
The best revenge is massive success.
多样化是金融中唯一的免费午餐,但它需要纪律和耐心。
Happiness is as a butterfly which, when pursued, is always beyond our grasp, but which if you will sit down quietly, may alight upon you.