This being his first visit there,he found a great deal to interest him.这里this是什么用法为什么这样用,怎样翻译,

This being his first visit there, he found a great deal to interest him.
翻译：这是他第一次在那参观，他发现了很多吸引他的事物。
this　指代的是这个/这次，即这次参观活动。

This being his first visit there,这是一个独立结构，this在独立结构中做其逻辑主语。相当于一个原因状语；since this was his first visit there.

This being ...这是一个独立主格结构.如果去掉This,句子就变成：Being his first visit there,he found ...这时,he就成为being这个分词的逻辑主语了,但是,he和being不能构成逻辑上的主语,这个句子是不成立的.解决的...

这里面的this是指示代词和being构成独立主格结构。
翻译为“这是他第一次到访那里，发现了很多令他感兴趣的事”。