4周搞定2000+托福核心词
顽童
urchin
常考释义
n. 海胆
The spines of the omnivorous pencil-spined urchin extend outward from its body. There are some 700 species of sea urchins worldwide.
这个铅笔状的杂食性海胆的刺从它们的身体里伸出来。全世界有700多种海胆。
Since the disappearance of sea urchins from the waters up the coast of South Florida, many coral reefs there have been smothered by the uncontrolled growth of algae.
由于在南佛罗里达海岸线海胆的消失，许多珊瑚礁已经被失控疯长的海藻给窒息了。
来源于：听力OFFICIAL27 L2A good illustration of this occurred after sea otters were eliminated from some Pacific kelp (seaweed) bed ecosystems: the kelp beds were practically obliterated too because in the absence of sea otter predation, sea urchin populations exploded and consumed most of the kelp and other macroalgae.
海獭被从太平洋海藻（海草）床生态系统中移除就是一个很好的例子：没有了海獭捕食，海胆数量暴增，吃掉了大量海带和其他大型海藻，海草床也因此不复存在。
来源于：阅读OFFICIAL46 P3n. 刺猬
n. 顽童，淘气鬼
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