求翻译：Companies have two methods available to them for measuring the net value of account receivables, which is computed by subtracting the balance of an allowance account from the accounts receivable account. The first method is the allowance method, which establishes a contra asset account, allowance for doubtful accounts, or more simply, allowance, as the offset to accounts receivable. Allowance is a contra asset that offsets the accounts receivable account to derive the net accounts receivable depicted in the balance sheet. The amount of the allowance can be computed in two ways; through the analysis based on sales method and analysis based on accounts receivable method. The reason a contra asset receivable account is necessary is to adhere to the matching principle of accounting, which mandates that accrual basis companies match all revenues and expenses with the period in which expense, and crediting the allowance contra asset account. Once it has been deemed that a particular account is uncollectible, it would be necessary to take the account off a company's books by debiting allowance for doubtful accounts and crediting the associated accounts receivable account.是什么意思？

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