难度 nándù degree of difficulty
How to remember 难度: 难 difficult + 度 degree = degree of difficulty.
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How it is used
- Level/degree of difficulty - 难度很大 (nándù hěn dà) very difficult; 增加难度 (zēngjiā nándù) raise the difficulty.
- A gradable noun: difficulty is 大/小 (dà/xiǎo), not 高/低. Common in sports, games, and tasks.