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正如几何学最自然的起点是数学点,在观察和自然历史中采用同样的方法也最真实、简单且富有教益。
Leadership means making tough decisions today that will benefit future generations.
I don't believe in anything, and that gives me great freedom.
The labor which it would require to make a single one of these guns by hand would exhaust the patience and perseverance of any ordinary workman.
"Sometimes we get sad about things and we don’t like to tell other people that we are sad about them."