账簿记录中使用的红字，具有特定的涵义，它表示蓝字金额的减少或负数余额。
Thee scarlet letter use records, has a specific meaning, it said the blue words amount to reduce or negative balance.
SR3：系统根据指定数额从账户中提取现金，但是取款后不能导致余额为负数。
SR3: The system shall withdraw a given amount of money from the account, but only if the resulting balance is not negative.
SR3：系统根据指定数额从账户中提取现金，但是取款后不能导致余额为负数。
SR3: The system shall withdraw a given amount of money from the account, but only if the resulting balance is not negative.
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