因此，如果一個人想向觀眾說明自己的想法，PowerPoint是當時最有

因此，如果一個人想向觀眾說明自己的想法，PowerPoint是當時最有利的工具。

Results (English) 1:

Therefore, if one wants to explain his ideas to the audience, PowerPoint was the most advantageous tool at the time.

Results (English) 2:

So If a person wants to explain their ideas to the audience, PowerPoint was the most advantageous tool at the time.

Results (English) 3:

Therefore, if a person wants to explain his idea to the audience, PowerPoint is the most advantageous tool at that time.