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Sustainable forestry is not an option; it's an obligation.
可持续林业不是一种选择;它是一种义务。
The fundamental defect of fathers is that they want their children to be a credit to them.
Die Hoffnung ist der Schlüssel zum Leben.
In mathematics, you don't understand things. You just get used to them.
The most dangerous weapon is not the one that kills, but the one that changes minds.