grand unified theory
noun 🔊/ˌɡrænd ˌjuːnɪfaɪd ˈθɪəri/ 🔊/ˌɡrænd ˌjuːnɪfaɪd ˈθiːəri/, 🔊/ˌɡrænd ˌjuːnɪfaɪd ˈθɪri/ (physics物理)- a single theory that tries to explain all the behaviour of subatomic particles大统一理论（试图解释亚原子粒子的所有活动方式的单一理论）