四大皆空：佛教用语，指世界上一切都是空虚的。（印度古代认为地、水、火、风是组成宇宙的四种元素，佛教成为四大。）

(Budd.) the temporal world is illusory; all physical existence is a vanity (In ancient India, the universe was thought to comprise four elements — earth, water, fire and wind, called 四大(si da), meaning the world.