Why these english letters are very wide?

[buptyyf]

Example pdf:
英国工人阶级状况 .pdf

Text letters in this page are very wide. Why? And How can I convert these letters to normal size?

doc = fitz.open('xxx.pdf')
page_dict = doc[6].get_text('dict')
page_dict['blocks'][2]['lines'][0]['spans'][1]['text']

[JorjMcKie]

Apologies for the tardy answer. I finally stumbled over this again.
There is nothing you can do here, I am afraid. The English text is simply stored like you see it. Probably it was a scan from some original, which was then badly incorporated.
I tried to copy / paste it with Adobe Acrobat and other PDF viewers and it never got any better.