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訳が不適切で文章間の関連が不明瞭となっていたのを改善した。
このパラグラフは「演算子族だけで十分そうなのに、なぜわざわざ演算子
クラスが必要なのか」を説明しているので、bother は「わざわざ〜」と
訳すのが適切と思われる。
また、"how much of the family" は「どれだけ多くの演算子族が」
(= how many families") ではなく 「演算子族(のメンバーの内)
どれだけが」の意味と思われる。