+that Many people still have the illusion that full employment is possible. 许多人还有这种错觉，认为可以实现充分就业。

create/give/maintain the illusion This description creates the illusion that we can solve all our environmental problems. 这种描述产生了这样一种错觉，即我们能够解决所有的环境问题。

be under no illusion/illusions (=not have a false idea) We are under no illusion that this money will be enough. 不会有错觉；不抱幻想

have no illusions (=realize that something is difficult or unpleasant) I had no illusions about the task that lay ahead. 不抱幻想（指意识到某事物很难或令人不快）

For some time, Yeltsin’ s rule provided an illusion of stability. 有一段时间，叶利钦的统治给人一种稳定的假象。

give/create the illusion of sth Glass bricks in the bathroom gave the illusion of lightness and space. 浴室里的玻璃砖营造出一种明亮感和空间感。