cloud-cuckoo-land

n ideal place or state of affairs that exists only in the mind of an impractical or unrealistic person （脱离现实的）理想境界.

closing-time, closure, clot, cloth, clothe, clothes, clothes moth, clothes-basket, clothes-brush, clothes-hanger, clothes-horse, clothes-line, clothes-peg, clothing, clotted cream, cloture, cloud, cloud chamber, cloud plains, cloud-bank, cloudburst, cloudiness, cloudless, clouds, cloudy, clout, clove, clove hitch, cloven, clover, clover-leaf, clown, clownish, cloy, cloying, cloze test, club, club car, club sandwich, club-foot,