n. any collection of particles (e.g., smoke or dust) or gases that is visible
n. a visible mass of water or ice particles suspended at a considerable altitude
n. out of touch with reality
n. a cause of worry or gloom or trouble
n. 云, 阴暗, 烟雾, 疑团
vt. 以云遮敝, 笼罩, 使黯然
vi. 乌云密布, 阴沉