Definition
To disappear suddenly and completely, leaving no trace.
形容突然且完全地消失，不留痕跡。
The project vanished in a puff of smoke after the funding ran out.
這個項目在資金耗盡後瞬間消失了。
His promises of help disappeared in a puff of smoke, leaving us very disappointed.
他承諾的幫助瞬間消失，讓我們非常失望。
All their hopes went up in a puff of smoke when they learned that they had lost the game.
當他們得知輸掉比賽時，所有的希望都化為泡影。