估计问题的性质不同。在这里，我们不关心检验特定的假设，而是关心估计参数的值。
化学的语言是通用的，超越了国界和文化。
The best time to plant a tree was 20 years ago; the second-best time is now.
I don't care if you're black, white, straight, bisexual, gay, lesbian, short, tall, fat, skinny, rich or poor. If you're nice to me, I'll be nice to you. Simple as that.
技术的未来不仅关乎我们创造的设备，还关乎我们围绕它们构建的生态系统。
Acting is not about being someone else. It's about finding the truth in yourself and bringing it to the surface.