历史的重量总是存在于我们使用的材料中。
A good mathematician is one who can see analogies between theorems; a great mathematician is one who can see analogies between analogies.
Innovation in grain production isn't just about technology - it's about changing mindsets.
要给儿童提供一个使他们得到满足的环境,必须努力了解儿童的需要。