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相性が

compatibility

→ 相性
phrase Rare #31,973
compatibility が marks 相性 as the subject. The phrase is commonly followed by いい or 悪い to describe whether people or things are compatible.
JA: この二つのソフトは相性がいい。
EN: These two software programs work well together.

あの投手とはどうも相性がよくない。

I just don't seem to match up well against that pitcher.

あいつとはどうも相性が合わないんだ。

I just don't seem to click with him.

私と彼はいつも相性がよい。

He and I have always gotten along well.

私と彼女は相性がいい。

She and I are a good match.

あの夫婦は相性が悪い。

That couple is incompatible.

私は彼女とは相性が良くなかった。

She and I just weren’t compatible.