Unless it is applied to real experiences, book knowledge remains theoretical and, in the end, is useless.

除非把书本知识应用到实践中去，否则它仍然停留在理论层面，这样最终就毫无用处。

youdao

Unless it is applied to real experiences, book knowledge remains theoretical and, in the end, is useless.

除非把书本知识应用到实践中去，否则它仍然停留在理论层面，这样最终就毫无用处。

youdao