Navigation has never been a task that can be accomplished by one person or one skill alone, but rather a multi-disciplinary collaboration that combines wisdom, technology and experience. An excellent crew member must be proficient in various marine operation processes, including ship operation, daily engine ＿＿（51）＿＿ , and emergency repair of system abnormalities, all of which are related to the safety of the ship itself and the lives of the crew. In addition, navigation planning also needs to take into account tides, ocean ＿＿（52）＿＿ , port restrictions and maritime traffic density to ensure that the voyage is both safe and efficient. The construction of the vessel that carries the crew is also important. The stability, wave resistance and ＿＿（53）＿＿ of a ship all depend on the scientific design of its skeleton structure and the use of materials. Finally, before leaving the port, the ship needs to ＿＿（54）＿＿ the latest meteorological maps and sea condition simulations and make risk predictions based on the climate characteristics of different sea areas. Therefore, only by fully mastering seamanship, navigation technology, knowledge of ship structure and the ability to interpret sea conditions can one take the lead in the ＿＿（55）＿＿ maritime environment and ensure the safe arrival of the ship and crew.