A signed invoice presumes receipt of the shipment.

经过签收的发货单表示运去货物已收到。

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Fee payments should be made within 30 days of the receipt of the invoice or by the due date of the invoice whichever is earlier.

家长在收到账单30天之内或账单到期日之前（以较早日期为准）应支付相应费用。

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The organizer will give the receipt to exhibitors first after receiving charges, then the exhibitors will exchange receipt for invoice during the exhibition period.

承办单位收到参展款项后，先开具收据，参展商凭收据在展会期间换取。

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