One key objective of maritime administration is to ensure safer waterways, protection of environment and provide more economically effective environment for ship traffic. So it is necessary to extend its range of management.是什么意思_One key objective of maritime administration is to ensure safer waterways, protection of environment and provide more economically effective environment for ship traffic. So it is necessary to extend its range of management.在线翻译_英语_读音_用法_例句