Utopian
adj
(usu derog 通常作贬义) having or aiming for the perfection of Utopia but impossible to achieve; idealistic 乌托邦的; 空想的; 理想主义的
Utopian ideals 不切实际的理想.
Perhaps the most extraordinary building of the nineteeth century was the Crystal Palace, which was built in Hyde Park for the Great Exhibition of 1851.