The theory cited by Mr. Tao Xingzhi in the paper needs to be marked to avoid plagiarism and infringement. Generally speaking, the labeling method can follow the following steps:

1. First of all, when Mr. Tao Xingzhi's famous words or theories appear in the paper, they need to be marked with quotation marks to show that they are his original words or thoughts.

Secondly, add the name of Mr. Tao Xingzhi before or after the quotation to make it clear that this is his point of view.

3. Finally, in the reference part of the paper, it is necessary to list the relevant works of Mr. Tao Xingzhi, so that readers can consult the original text.

The specific annotation format can be determined according to the citation norms used in the paper, and generally you can refer to the commonly used citation norms such as APA and MLA. For example, in the APA specification, you can use the following methods for labeling:

"A straight body is not afraid of a crooked shadow" (Tao Xingzhi, 1943)

References:

Tao Xingzhi. (1943). Reading record. Beijing: Commercial Press.