aggregate cost的用法和樣例：
例句
- The total cost of stocks purchased should be debited to an investment account.
購入股票的總成本應借記投資賬戶(hù)。 - The proposed algorithm is capable to search the supplemental policy to minimize the cost of the concerned period.
利用該算法可以找出在計劃時(shí)段內總成本最小的補充策略。
