1 N-SING 海洋;大海 The ocean is the sea. 海洋;大海
SYN sea, the deep, the waves, main
2 N-COUNT; N-IN-NAMES (五大洋之一的)洋 An ocean is one of the five very large areas of sea on the Earth's surface. (五大洋之一的)洋
3 N-COUNT 许多;大量 If you say that there is an ocean of something, you are emphasizing that there is a very large amount of it. 许多;大量 [informal, emphasis]
4 PHRASE 沧海一粟;九牛一毛 If you say that something is a drop in the ocean, you mean that it is a very small amount which is unimportant compared to the cost of other things or is so small that it has very little effect on something. 沧海一粟;九牛一毛 [emphasis]
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