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.
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.
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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