解释：人有知识，犹如树木有枝叶，树木有了枝叶，能带给人阴凉，人有了知识，就可以为人民做更多的事。

Variant: All human actions have one or more of these seven causes: chance, nature, compulsions, habit, reason, passion and desire.

I think the most important thing is to be honest and truthful with what you say and what you do.

创新是企业发展的不竭动力。