reef

礁、暗礁、礁石

The ship struck a reef and began taking on water.

那艘船撞上暗礁，開始進水。

珊瑚礁

Warmer oceans are bleaching coral reefs around the world.

海水變暖正讓世界各地的珊瑚礁白化。

縮帆部航海

He tied in a reef to reduce the sail area.

他繫上縮帆部以減少帆面面積。

縮帆、捲帆航海

We reefed the mainsail as the wind picked up.

風勢轉強時，我們把主帆縮了起來。