improper investment的用法和樣例：
例句
- Once the investment account is exhausted, the policy shall be terminated.
當投資賬戶內無結存金額，本保單即告終止。 - One is that when investment bankers owned the banks themselves, partners demanded higher returns on their equity than public shareholders now get.
其一，當投資銀行家們本身擁有銀行，投行合伙人則要求獲得比公眾股東更高的回報。
