求翻译：在装船时，货物外表状况良好，承运人在签发提单时，未在提单上加任何有关货物残损、包装不良、件数、重量和体积或其他妨碍结汇的批注的提单称为清洁提单。是什么意思？

At the time of shipment, In apparent good order and condition of the goods, the carrier at the time of issuance of bills of lading, plus any cargo is not in the Bill of lading the damage, poor packaging, number of pieces, weight and volume of comments or other prejudice to the settlement of the Bill of lading is called a clean bill of lading.