与其重复定义和管理这些属性的代码，不如创建一个通用的帐户(account)类，该类具有现金收支平衡并且可以处理借贷事务。
Rather than duplicate the code that defines and manages these properties, you can create a common Account parent class that has a cash balance, and can handle credit and debit transactions.
摘录：一切在乎现金流：一个好的业务计划必须能合理预测收支平衡点。
Cash flow is everything: a good business plan must provide you a reasonable forecast of...
即使可能要有段时间才能达至收支平衡，至少任何时候你都应该确保手头现金充裕。
Even it may take time before breakeven point can be met, you should at least ensure the cash on hand should maintain a comfortable level at all times.
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