It reefs its sail when a storm threatens or the wind blows pretty hard, and furls it entirely and goes down when a gale blows. 马克·吐温.傻子出国记.
It is commonly found in reefs or veins among quartz, and in alluvial deposits; it is separated, in the former case, by quarrying, crushing, washing and treatment with mercury. 佚名.神奇的知识之书.
It was on the principle of the gradual subsidence (and elevation) of the bed of the Pacific Ocean that Darwin accounted for the formation of coral reefs. 李贝.西洋科学史.
Right enough, as long as we're in the open sea, retorted Martin gloomily, but Lord help us if we touch any of them darned reefs. 弗格斯·休姆.奇幻岛.