adv.主要地
The book is aimed principally at beginners. 这本书主要是为初学者编写的。
The dialect is spoken principally in the rural areas. 这种方言主要在农村地区使用。
The money is invested principally in government stock. 这笔钱主要投资于政府公债上。
Laughing is the sensation of feeling good all over, and shows it principally in one spot. 笑，是全身舒畅的感觉，而却主要表现于一个部分。
