What does the underlined word "that" in paragraph 2 refer to?

第二段中划线的单词“that”指的是什么？

youdao

We can know scientists try different ways to make observations in paragraph 2.

在第二段中，我们可以知道科学家尝试不同的方法进行观察。

youdao

Users can set the lyophilization process as required in paragraph 2-36.

用户可以根据需要设定2 - 36段冻干工艺。

youdao

This decision of the General Assembly shall be taken by a majority of the States Parties present and voting which have not made the declaration referred to in paragraph 2 of this Article.

UNESCO: Intangible Cultural Heritage