another matter

基本解释

That's quite another matter.
那完全是另一回事。
《新英汉大辞典》
Water on the moon, however, is another matter.
不过，在月球上的水，却是另一回事。
Whether they are brave enough to explain this to their voters is another matter.
当然，他们是否有足够的勇气向国民解释这些，则是另一回事了。

(Speaking in Russian) Lipman says the move is very smart, though whether it will work is another matter.
It's not a question, in other words, of poetry or of a novel being somehow or another strictly a matter of poetic language.
毫无疑问，诗歌或小说是,诗化语言的严格体现。
耶鲁公开课 - 文学理论导论课程节选
You need a functional form that connects the value at one state of matter, the freezing point of water to another phase change, the boiling point of water.
你需要一个函数形式来,连接物质某个态对应的温度值，如水的冰点，和另一个相变,如水的沸点。
麻省理工公开课 - 热力学与动力学课程节选

Whether all this will allow Rockwell to survive as a stand-alone company is another matter.
FORBES: Choreographer of the Assembly Line