推荐回答（4个）
英文里一个单词会有多个意思，当 negative 的意思是 “负面”时，它的反义词就是 positive “正面的” ; 但是当 negative 的意思是 “否定”时，它的反义词就是 affirmative “肯定的” 。总之英语不像汉语有那么多的词语可供选择，因此必须学会变通的应用。结合你问题中的语境的话,辨论中总有一方是肯定命题，另一方是否定命题的，所以这种语境下 affirmative 和 negative 是一对反义词。
“negative”的反义词是“positive ”。
positive
读音
英 【ˈpɒzətɪv】 美 【'pɑzətɪv】
释义
adj. 积极的；[数] 正的，[医][化学] 阳性的；确定的，肯定的；实际的，真实的；绝对的
n. 正数；[摄] 正片
比较级 more positive最高级 most positive
例句
1、"All of the evidence suggests we have reasons to be positive, " he said.
“所有的证据表明，我们是有理由如此肯定的，”他说。
2、But there are some new positive signs. 但是，目前有一些积极的新迹象。
negative
读音
英 【'negətɪv】 美 【'nɛɡətɪv】
释义
adj. [数] 负的；消极的；否定的；阴性的
n. 否定；负数；[摄] 底片
vt. 否定；拒绝
过去式 negatived过去分词 negatived现在分词 negativing
例句
1、How many copies shall we print from the negative?
用这张底片我们要印多少张相片?
2、Not only that, but it also focuses your thoughts and entire being on the negative.
不仅如此，那样还会让你的思想，你整个人只看到消极的东西。
negative的意思是消极的，反义词就是积极的乐观的active、positive 、energetic
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