phrase a large amount or number of something: 相当多，大量 The teacher looked down and saw a sea of smiling faces.老师向下看去，看到一张张微笑的脸庞。 It's been raining nonstop here for three days and I'm surrounded by a sea of umbrellas. The singer looked out over a sea of waving hands. The floor of the crater melted and turned into a sea of molten rock. In April, this whole meadow becomes a sea of wildflowers. See also
sea
sea of something | American Dictionary
sea of something
idiom a lot of something: She looked out at the sea of faces in the audience.