1. They say he is a mischief-maker, a tramp, a street urchin—Calumnies! 他们说他是个捣蛋鬼，是个流浪汉，是个街头顽童——诋毁！
2. The spines of a fire urchin form a multicolored flower off Komodo Island, Indonesia. 火海胆的刺在印度尼西亚科莫多岛附近形成了五颜六色的花朵。
3. In the first century A.D., Pliny the Elder wrote of using sea urchin ashes to treat baldness. 公元一世纪，老普林尼曾写过用海胆的灰烬治疗来秃头。
4. She is investigating the effects of changing acidity and temperature in the sea on a creature called the purple sea urchin. 她正在调查改变海水的酸性和温度对叫紫海胆的这一生物的影响。
5. The bright red color of a fire urchin warns predators that its spines are poisonous. Sea otters are the major predators of sea urchins. 火海胆鲜红的颜色警告捕食者它的刺有毒。海獭是海胆的主要捕食者。
