笑: laugh, smile...
观望: to wait and see, to watch from the sidelines, to look around, to survey...
不翼而飞: to disappear without trace, to vanish all of a sudden, to spread fast, to spread like wildfire...
印刷术: printing, printing technology...
等: class, rank, grade, equal to, same as, wait for, await, et cetera, and so on...
尿: (coll.) urine...
随手: conveniently, without extra trouble, while doing it, in passing...
学时: class hour, period...
乔装: to pretend, to feign, to disguise oneself...
冷气: air conditioning (Tw)...
