() [; ]an amount of money that is lent or invested to earn interest资本；本金◆You must make the required interest and principal payments.你必须支付规定的利息和本金。 () [] a person who is actually making a business deal or taking part in a legal case, rather than a person who is acting on their behalf本人；当事人 [] an important manager or other person in an organization, who usually has legal responsibility for what the organization does主管◆The company's three principals are women.公司的三位主管均为女士。