impermanent

Longman Dictionary of Contemporary English 5++朗文当代英语 5++LDOCE 5++朗文 5++im·per·ma·nent /ɪmˈpɜːmənənt $ -ɜːr-/ adjective formal ALWAYS/EVERY TIMEnot staying the same forever 非永久的，临时的 SYN temporary OPP permanent single-storey structures, built from cheap and impermanent materials 用廉价而不耐久的材料建成的单层建筑 —impermanence noun [uncountable] His philosophy stressed the impermanence of the world. 他的哲学观点强调世界的无常。

Examples from the Corpus

impermanent• Even the history of discontinuities is itself impermanent and discontinuous.• Buddhism stresses that life is impermanent and full of suffering.• I see their hopes like Masai villages, impermanent and leaving few marks on the landscape.• Why not respect the intention implied by the choice of impermanent materials and the adoption of quick and casual techniques?• They may have been of impermanent materials, such as wood, or the countries may have suffered greater devastation than their neighbours.• In fact, the massive increase in migration contained a considerable quantity of impermanent movement - temporary, seasonal or merely nomadic.• But all things in this impermanent world are essentially rootless.