the principal sum的用法和樣例：
例句
- The company capitalized its reserve funds.
這家公司把儲備基金用作資本。 - Thought, not money, is the real business capital.
真正的商業(yè)資本，是思想，而非金錢(qián)。 - You should repay principal and interest.
你必須償還本金和利息。 - Interest is reckoned as a certain percentage yearly on the principal.
利息按照某個(gè)比例在本金的基礎上每年計算一次。
