第１と第２の、複数の同一名詞の修飾、いつも迷う奴

基板は第１及び第２の端面を有する。

ChatGPT:

ChatGPT

The substrate has first and second end surfaces.

あなた:

How about "The substrate has a first and a second end surfaces"?

ChatGPT:

ChatGPT

"The substrate has a first and a second end surfaces" is close, but it would be more grammatically correct to say:

"The substrate has a first and a second end surface."

Using "surface" in the singular form here is appropriate because "a first and a second" indicates two distinct items without needing pluralization.