“赚取利息”常见的英文表达是 “earn interest” 。
例如：
You can earn interest by putting your money in a savings account.（你把钱存入储蓄账户就能赚取利息。）
He invests his extra money to earn interest and grow his wealth.（他把多余的钱用于投资以赚取利息并增加财富。）