ship at Sea的用法和樣例：
例句
- At night, ships at sea carry a red light on the port side and a green light on the starboard.
夜晚,海上的船亮起左舷的紅燈和右舷的綠燈。 - Explorers in remote areas, ships at sea, even astronauts circling the earth axe able to keep in touch with civilization by means of radio.
到遙遠地區探險的人們，在海上航行的輪船，甚至繞地球環行的宇航員們，都能藉助無線電與有人居住的地方保持聯繫。
