完善相关法律法规，用英语怎么说？

答案：

improve relevant laws and regulations

例句：

中国将保持外资政策的连续性和稳定性，完善相关法律法规，为外商创造良好的投资环境。

China will maintain the continuity and stability of its FDI policy, improve relevant laws and regulations and create a sound investment climate for foreign businesses