theoretical /θiəˈretikəl/ adj. 1. 理论的：theoretical chemistry(physics) 理论化学（物理）；the theoretical value of their work他们工作的理论价值 It's a theoretical matter as well as a practical one.这不仅是个实践问题, 也是个理论问题。2. 推想的，假设的：It's only a theoretical possibility.这只是一种假设的可能性。
theory /ˈθiəri/ n.［c］&［u］ 1.理论，原理：combine theory with practice理论和实践结合Your plan is excellent in theory, but would it succeed in practice? 你的计划理论上好极了，但在实行时会成功吗? 2.学说：Darwin’s theory of evolution 达尔文的进化论 3. 看法，见解(常缺乏根据)： I have a theory that a hot bath at night makes one sleepless. 我有个看法觉得夜里洗了热水澡就不能睡觉。
