marginal profit的用法和樣例：
例句
- Store productivity is declining, sales per square foot are falling and profit margins are shrinking.
店鋪生產率不斷下降，每平方英尺銷售量在下跌，邊際利潤在萎縮。 - Regarding the cost, rational commercial banks may hope its marginal profit gained by the engagement in its reputation promotion equals to the banks' lose due to hacker's attack.
理性的商業銀行出於成本的考慮，會希望在提高聲譽過程中所獲得的邊際利潤與因駭客進攻而導致的銀行損失相等。
