ob·verse /ɑbˈvɝs, əb, ˈɑbˌ/
 表面,正面,反面(a.)尖端闊大的,正面的,對應面的
 Ob·verse a.  Having the base, or end next the attachment, narrower than the top, as a leaf.
 Ob·verse n.
 1. The face of a coin which has the principal image or inscription upon it; -- the other side being the reverse.
 2. Anything necessarily involved in, or answering to, another; the more apparent or conspicuous of two possible sides, or of two corresponding things.
    The fact that it [a belief] invariably exists being the obverse of the fact that there is no alternative belief.   --H. Spencer.
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 obverse
      n 1: the more conspicuous of two alternatives or cases or sides;
           "the obverse of this issue"
      2: the side of a coin or medal bearing the principal stamp or
         design [ant: reverse]