货物须用适用于海运的坚固的木箱包装.The goods are to be packed in strong seaworthy wooden cases.用适于海运的箱子, 每箱装50盒.In seaworthy boxes, 50 packs to one box.但纸箱是适于海运的.But cartons are quite seaworthy....

“海运的”的英语可以翻译为：marine，seaborne ...