空洞的词句 meaning in English

empty phraseology

And should the usefulness which is expressed by the law vary and only for a time correspond with the prior conception , nevertheless for the time being it was just , so long as we do not trouble ourselves about empty words , but look simply at the facts
假如用法律表述的有用性不断变化，只能暂时性地符合先决条件，那么只要我们不拘泥于空洞的词句，而直接关注事实，那么在这段时间里法律还是可以称为正义的。