Progress in Chinese starts with characters, then words, finally idioms. Here’s a free look at 「單文孤證」 and its explanation.
The featured idiom 「單文孤證」 is explained here, including its meaning and how to use it.
The only evidence. It means not trustworthy.
The Mandarin pronunciation of this idiom is :
dān wén gū zhèng
while its Cantonese pinyin is :
daan1 man4 gu1 jing3
The collection of Chinese idioms is enormous, with each one holding its own meaning and purpose. We hope these resources can assist you in better understanding and learning Chinese.

