THE SMART TRICK OF BROKER ETYMOLOGY THAT NO ONE IS DISCUSSING

The doing exercises or occupying in the brain, esp. the understanding, in an Lively way; engagement in mental action or action: see numerous senses of…purpose, ground - a rational motive for the perception or motion; "The explanation that war was declared"; "the grounds for their declaration"知乎，让每一次点击都充满意义 —— 欢�