act of usury的用法和样例：
- The interest of usury is unfairly high.
- This dreadful murder is surely the act of a madman.
- Don't complain of anybody. This is an act of God.
- He was caught in the very act of espionage.
- Now the interest of usury is moving up to $3,000.
- She worked over the first act of the play.