这个主意在理论上和实践上都站不住脚。

In theory as well as in practice, the idea is unsound.

youdao

这一课程模式在理论上和实践上经过不断的研究和摸索，已逐渐趋于完善。

This model tends to perfect gradually after researching continually in the theory and practice.

youdao

尤其是对于交货托运人的定义和理解，理论上和实践上存在很多观点和看法，值得我们研究。

It is worthy of researching and exploring the definition and understanding of consignor in particular because of the existence of many viewpoints and ideas about it.

youdao