Introspection is the only method by which the mind can be directly observed.

The past is what you remember, imagine you remember, convince yourself you remember, or pretend you remember.

农业现代化不是简单的机械化，而是要让农民真正掌握科技，用智慧种地。

蓬草长在麻地里，不用扶持也能挺立住；白沙混进了黑土里，就会变得和土一样黑。