theory
英['θ??r?]
美['θi?ri]
- n. 理論；原理；學說；推測
詞組搭配
in theory
used in describing what is supposed to happen or be possible, usually with the implication that it does not in fact happen
理論上（應該）；照道理
in theory, things can only get better; in practice, they may well become a lot worse.
理論上情況只會變好，實際上卻很可能變得更糟。