自然定律相对于参考系变换的对称性是物理学最基本的原理之一。
The writer’s mission is to uncover the hidden.
质量不是一种行为,而是一种习惯。
Quality is free. It's not a gift, but it's free. What costs money are the unquality things -- all the actions that involve not doing jobs right the first time.
The strength and power of despotism consists wholly in the fear of resistance.