讀到這詞 rubber dam (20世紀初發明的)
A thin sheet of latex rubber used to isolate a tooth or teeth and keep them dry during a dental procedure.
起先不知道為什麼取名 dam
稍想之後 才了解 dam 是防口水用的(dam━━ n. ダム, 堰(せき); ダム湖; せきとめた水.
━━ vt. （-mm-） せきとめる; ふさぐ ((up)); （激情を）抑える ((up, back)).)
然後查到這資料
dental dam noun [C]
a piece of rubber which is used to keep the teeth dry during dental treatment, or which is used to prevent HIV infection during sexual activity in which someone touches someone else's sexual organs with their mouth or tongue
(from Cambridge Advanced Learner's Dictionary)
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