/ˈʌndə(r) ||; ˈʌndɚ/prefix1 (used in nouns and adjectives 用于构成名词及形容词) below 下面;在…之下: underground 地下undergrowth 下层灌木丛
2 (used in nouns 用于构成名词) lower in age, level or position (年龄、水平、地位)低于…的: the under-fives 五岁以下儿童an under-secretary 副部长
3 (used in adjectives and verbs 用于构成形容词及动词) not enough 不足: undercooked food 煮得欠熟的食物