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种树的最佳时间是20年前,其次是现在。
The best time to plant a tree was 20 years ago. The second best time is now.
自私性是一种自爱,怜悯心是一种他爱。一个人想要得到他人的爱,他自己首先应具备爱人之心。
我不是一个政治作家,但我是一个有政治意识的作家。
Trust is the most valuable resource in mining—harder to earn than any mineral.
A mathematician's work is never done; there are always more problems to solve.