It is a curious subject of observation and inquiry, whether hatred and love be not the same thing at bottom.
消化道是一条穿过整个生物体的管道。
Your self-worth is determined by you. You don't have to depend on someone telling you who you are.
成功的衡量标准不仅仅是利润，还有我们创造的积极影响。
No matter how complex or refined, all behavior is to be explained in terms of stimulus and response.
无论多么复杂或精细，所有行为都可以用刺激和反应来解释。