







difficult problem
puzzle
knotty problem
It took years to understand many perplexing diseases.
This example demonstrates the three key problematic issues.

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Open the tool →疑难 (yí nán) means “difficult problem, puzzle, knotty problem”.
疑难 is pronounced yí nán in Mandarin Chinese.
“difficult problem” is 疑难 (yí nán) in Chinese.
This page has 2 example sentences using 疑难, each with pinyin and an English translation.