B1 first in order of importance最重要的
More examples
The principal aim of this meeting is to reach a decision that we all agree on.
The diaphragm is the principal muscle of respiration.
I would like to earn more, but this isn't my principal reason for leaving the job.
He can't give up teaching, it's his principal source of income.
This is the principal road between the two cities.
[ C usually singular ] specialized finance & economics an amount of money that someone has invested in a bank or lent to a person or organization so that they will receive interest on it from the bank, person, or organization本金;可生息的资本
noun
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