没有道德或不道德的书，只有写得好或写得差的书。
The only way to learn mathematics is to do mathematics.
白立方并非中立——它承载着自己的文化包袱。
The rise of a new great power is always a cause for concern among existing powers, as it threatens the existing balance of power.
The heart of a mother is a deep abyss at the bottom of which you will always find forgiveness.