求高手帮我解释一下这一句话的语法句型短语什么的.But to acknowledge only th

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But 转折词
主语:to acknowledge only the positive impact 不定式短语作主语
谓动:would be 连系动词
表语:short sighted.
But to acknowledge only the positive impact would be short sighted
句意:然而,只承认其积极的影响是目光短浅的/是鼠目寸光.