求翻译：Since not all customer debts will be collected, businesses typically record an allowance for bad debts which is subtracted from total accounts receivable. When accounts receivable are not paid, some companies turn them over to third party collection agencies or collection attorneys who will attempt to recover the debt via negotiating payment plans, settlement offers or legal action. Outstanding advances are part of accounts receivables if a company gets an order from its customers with payment terms agreed in advance. Since no billing is being done to claim the advances several times this area of collectible is not reflected in accounts receivables. Ideally, since advance payment is mutually agreed term, it is the responsibility of the accounts department to take out periodically the statement showing advance collectible and should be provided to sales & marketing for collection of advances. The payment of accounts receivable can be protected either by a letter of credit or by Trade Credit Insurance.是什么意思？

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