sea/siː/
n.1. 大海，海洋North Sea北海
At the beginning of the journey, the sea was asleep.刚起程时海上风平浪静。
2. 海，内海the Caspian Sea里海
3. （与of连用）似海的东西；广阔，无限，浩瀚a sea of flames一片火海
4. 海岸， 海滨；海边The machine was used in a cave near the sea-shore where - it is said - pirates used to hide gold.有人在海岸附近的一个山洞里用过这台机器，据说海盗过去惯常把黄金藏在那儿。
5. 海浪；大浪The ship was struck by a heavy sea.该船被巨浪冲击。
6. 月球上任何一处广阔的平原the Sea of Tranquility宁静海