but each urchin has five teeth, which are self sharpening and are replaced every few months. 但是每只海胆有5个锋利的牙齿 而且每隔几个月就换牙

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sharpening self urchin teeth replaced which every few five has months each are but and
  1. An army of sea urchins is mounting an attack.
    一大群紫海胆正在发动进攻
  2. The urchin plague strikes at the kelp's holdfasts their crucial attachments to the rock.
    海胆们正在吃巨藻的固着器 把巨藻固定在石头上的重要装置
  3. Holdfasts are extremely tough,
    固着器非常坚硬
  4. but each urchin has five teeth, which are self sharpening and are replaced every few months.
    但是每只海胆有5个锋利的牙齿 而且每隔几个月就换牙
  5. Urchins fell vast areas of kelp forest creating clearings know as urchin barrens
    海胆吃掉了大片的海藻森林 把它们变成了不毛之地.
  6. yet barrens is a poor description.
    无法形容的荒凉.
  7. Millions of invertebrates invade the seabed.
    百万只无脊椎动物侵袭了海床

来自《行星地球 第一季 第九集 Planet Earth S01E09 海洋》第 183 行

Walden21
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