按理该着 ought to ; should

按理该做某事 be due to do sth

你应该理解我 You should understand me like

你应该试着理解 you gotta try to understand

该亚理论 Gaia Theory

该整理衣柜了 Sort out your wardrobe

支持该理论的学者 Scholars support this theory

该理论 theory

你们应该合理安排时间 You should arrange your time

表示应该、理应做什么 ought to