obverse

名词 obverse:

1. the more conspicuous of two alternatives or cases or sides
2. the side of a coin or medal bearing the principal stamp or design

1. Inference of the obverse of a proposition.
   换质法推导一个命题的方法
2. The obverse of love is hate.
   与爱相对的是恨。
3. The head of the Queen appears on the obverse of British coins.
   英国硬币的正面有女王的头像。

ob.verse

adj.Abbr. obv.（形容词）缩写 obv.
Facing or turned toward the observer:
正面的：面对或转向观察者的：
例句：
the obverse side of a statue.
塑像的正面

Serving as a counterpart or complement.
对应面的：作为副本或补充物的
n.（名词）

The side of a coin, medal, or badge that bears the principal stamp or design.
正面：币、奖章或袖标的一面，带有主要的戳或图案
The more conspicuous of two possible alternatives, cases, or sides:
较明显的一面：两个可能的互换物、方案或方面中更引人注目的那个：
例句：
the obverse of this issue.
这个问题中更引人注目的一面

Logic The counterpart of a proposition obtained by exchanging the affirmative for the negative quality of the whole proposition and then negating the predicate:
【逻辑学】 换质命题：换质说明法，反换命题的配对命题，将命题假设中的所有肯定换成否定，再把结论变为否定而得到的命题：
例句：
The obverse of .Every act is predictable. is .No act is unpredictable..
.Every act is predictable.的反换命题说法是.No act is unprecictable.

来源：
Latin obversus [past participle of] obvertere [to turn toward] * see obvert
拉丁语 obversus [] obvertere的过去分词 [向…转身，转向] *参见 obvert

【引伸】
obverse.ly
adv.（副词）