() [; ]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。