reef [ri:f]

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n.礁，礁石，暗礁

a line of rocks or sand just above or just below the surface of the sea , often dangerous to ships

The ship and its crew were lost on the reef. 那条船及船员都触礁遇难了。
The ship was wrecked on a coral reef. 这条船在珊瑚暗礁上撞毁了。