首先看它的语境出处:
Mr. Bingley had soon made himself acquainted with all the principal people in the room; he was lively and unreserved, danced every dance, was angry that the ball closed so early, and talked of giving one himself at Netherfield.
描述mr. bingley在舞会上的首次亮相成功吸引了众人的目光。
这里的one是代词,指代a ball(一个舞会)
如果不用one来取代,这个部分就是:
“..., and talked of giving a ball himself at netherfield.”
“说他自己准备在netherfield举办舞会”
短语 give a ball=hold a ball 举办舞会
因为前面半句在说他对舞会结束如此之早感到不快时(was angry that the ball closed so early),已经用了“the ball(舞会)”,所以后半句只用one来代指,而不再重复说ball。因此one在这里是很简单的代词用法,指代前面出现过的名词。
另外,建议下次提问不明代词要提供上下文语境~