money is everything and knowledge is of no use.of起什么作用?不用of为什么不可以?

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money is everything and knowledge is of no use.
of起什么作用?不用of为什么不可以?

of no use
n.无用(无效)
例句:
It is of no use boasting of being rich on a desert island.
在无人岛上夸耀富有也是白费力气.
It is of no use to talk to him; he is as deaf as a post.
跟他说话毫无用处,因为他一点也听见.
Lacking worth; of no use or value.
无价值的不值得的;无用的或无价值的
固定搭配,一定要用