表示“对
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表示“对；向
A prefix signifying to, toward, before, against, reversely,；etc.; also, as a simple intensive; as in oblige, to bind to; obstacle,；something standing before; object, lit., to throw against; obovate,；reversely, ovate. Ob- is commonly assimilated before c, f, g, and p, to；oc-, of-, og-, and op-.
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表示“对；向
A prefix signifying to, toward, before, against, reversely,；etc.; also, as a simple intensive; as in oblige, to bind to; obstacle,；something standing before; object, lit., to throw against; obovate,；reversely, ovate. Ob- is commonly assimilated before c, f, g, and p, to；oc-, of-, og-, and op-.
Use ob- naturally, then get feedback on meaning, tone, grammar, and phrasing.
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Dictionary facts from ECDICT.