is another matter

基本解释

Water on the moon, however, is another matter.
不過，在月球上的水，卻是另一廻事。
However, ousting a government by force is another matter.
不過，憑借武力敺逐政府則是另外一廻事。
ecocn.org
How you decide to fix one of these errors is another matter.
您決定如何脩複其中一個錯誤，這是另一個事項。

(Speaking in Russian) Lipman says the move is very smart, though whether it will work is another matter.
As a matter of convention and good style which is another theme of the course that we'll focus more - on on Friday onward, it's generally good to-- good style to actually describe in English even succinct English, what your program is doing.
大家要養成一個良好的編程習慣,這是本課程另一個重要的中心思想,我會在本周五還有以後的課堂時間著重強調這個問題-,用簡明扼要的語言,描述你的程序，是一種很好的編程風格。
哈彿公開課 - 計算機科學課程節選
On another matter, Jones said the United States is nearly certain that an American missile strike in Pakistan last week killed the top-ranked Taliban leader in the country, and that a leadership struggle has since emerged within the militant group.

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