shipping bills英 [ˈʃɪpɪŋ bɪlz]美 [ˈʃɪpɪŋ bɪlz]网络 运货单据; 装运单据化学双语例句On Risks and Preventive Measures for Ocean Shipping Bills in World Trade试论国际贸易中海运提单的风险及防范措施