一个人即便计划得再好，假如没切实可行的条件，那梦想就好似烟雾一般虚无飘渺。大家一般用英语表达a pipe dream来指出某人的计划或想法好似白日做梦一般，行不通。这个说法有消极意味，所以不可以用来描述 梦想、美梦等相对积极的定义。

例句

My mother says my fathers plan to sail around the world in his retirement1 is just a pipe dream.

我妈妈说，爸爸想要在退休后扬帆出海、环游世界的计划只不过白日做梦。

The marketing2 manager is very confident and insists that her plan to increase company sales by 150% is not a pipe dream.

市场部经理坚信她计划提高公司销售额150%的策略不是空想。

My brothers laziness is evidence that his dream of becoming a successful entrepreneur is just a pipe dream.

我弟弟的懒惰足以证明，他想要成为成功企业家的黄粱美梦是行不通的。