PREFIX (用于某些词之前构成新词)表示“坏”，“不良”，“不当”Mal- is added to words in order to form new words which describe things that are bad or unpleasant, or that are unsuccessful or imperfect. (用于某些词之前构成新词)表示“坏”，“不良”，“不当”
Forty per cent of the population is suffering from malnutrition.