＝ ～は言うまでもなく
【板書メモ】
❑ to 不定詞 独立用法 ♠190
○ Keiko speaks French well, not to mention English. ［名詞］♠190
○ She is a former actor, not to mention a famours writer. ［名詞］
○ I was hungry, not to mention tired. ［形容詞］
○ We need enough clacium to keep our bones strong, not to mention to assist in many important functions of the body. ［to不定詞（目的を表す副詞的用法）］(英検2級文単より）