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reef
英/ɹˈiːf/
美/ˈɹif/
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01n.
暗礁, 礁, 缩帆
a submerged ridge of rock or coral near the surface of the water; one of several strips across a sail that can be taken in or rolled up to lessen the area of the sail that is exposed to the wind
02v.
缩(帆)
lower and bring partially inboard; roll up (a portion of a sail) in order to reduce its area