sudden的副词形式是suddenly，意思是adv. 忽然；突然地
它的用法是
The geographer was suddenly stirred to excitement.
地理学家忽然激动起来。
哈利波特与密室
Dobby suddenly froze, his bat ears quivering.
多比突然僵住了，两只蝙蝠状的耳朵颤抖着。
sudden的副词形式是suddenly，意思是adv. 忽然；突然地
它的用法是
The geographer was suddenly stirred to excitement.
地理学家忽然激动起来。
哈利波特与密室
Dobby suddenly froze, his bat ears quivering.
多比突然僵住了，两只蝙蝠状的耳朵颤抖着。
