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经济景观是一个由不同等级的中心地组成的系统,每个中心地为特定区域服务。
"The beauty of science is that it allows us to understand the world in a way that is both profound and practical."
The digital world should be accessible to everyone, regardless of background or ability.
I think it's important to be able to laugh at yourself.
Knowing what you don’t know is more useful than being brilliant.
The real hero is the one who knows how to live in peace, not in war.
I don't need a reason to be grateful.
The best products are those that solve real problems.
The greatest danger to American agriculture is the loss of the family farm.