1、prin- + cip- + -al + -ly.
2、字面含义：that takes first. => first in importance, principal, chief, "main, most important," of persons.
- principally (adv.)
- mid-14c., "mostly, mainly; most importantly," from principal (adj.) + -ly (2). Late 14c. as "first of all." Meaning "for the most part" attested by 1832.
- 1. The book is aimed principally at beginners.
- 2. He had married her principally for the sake of her father's property.
- 3. The sell-off is aimed at repositioning the company as a publisher principally of business information.
- 4. Embryonic development seems to be controlled principally by a very small number of master genes.
- 5. Our club was composed principally of students, with an admixture of young clerks.
- 我们的俱乐部主要由大学生组成, 外加一些年轻的职员.
[ principally 造句 ]