英语翻译

问题描述:

英语翻译
特别是这个 all that theory

应该是it is known to us all / that theory comes from practise.
to us all 所有人接一个that从句.all 可以去掉吗?可以,就是一个表达程度(所有)的。可不可以加个逗号?it is known to us all ,that theory comes from practisethat从句,不要加逗号