"Avoiding colpsions at sea" is the Engpsh phrase for "航海避碰." This refers to the measures that are taken to prevent ships from colpding with each other while saipng on the open ocean. These measures can include maintaining a proper lookout, using radar and other navigational equipment, and following estabpshed rules of the road, such as the International Regulations for Preventing Colpsions at Sea (COLREGs). It is important for ships to follow these procedures in order to ensure the safety of all vessels and crew members involved.