改进题：The seller must deliver goods which are of the quantity, quality and descriptions required by the contract and which are contained or packed in the manner required by the contract.

译文：卖方交付的货物必须与合同所规定的数量、质量和规格一致，装箱或包装也要按照合同所规定的方式。

改进题：The seller must deliver goods which are of the quantity, quality and descriptions required by the contract and which are contained or packed in the manner required by the contract.

译文：卖方交付的货物必须与合同所规定的数量、质量和规格一致，装箱或包装也要按照合同所规定的方式。

改进的译文：卖方交付的货物必须与合同所规定的数量、质量和规格一致，并按照合同所规定的方式装箱或包装。