New Words：

coral ['kɔrəl] n. 珊瑚
reef [ri:f] n. 礁；暗礁

Sample Sentences：

Coral is often used for making jewellery.
The Xisha Islands are formed of coral reefs.
The pilot guided us through the dangerous reefs.
It is reported that the coral reefs are being destroyed.

pilot ['pailət] n.飞行员；领航员；引航员

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