復雜的定語從句的拆分和理解 例20

例20　Studies of the Weddell seal in the laboratory have described the physiological mechanisms that allow the seals to cope with the extreme oxygen deprivation that occurs during its longest dives which can extend 500 meters below the ocean's surface and last for over 70 minutes.

【結構分析】主干是Studies of the Weddell seal in the laboratory have described the physiological mechanisms，后面是個連環(huán)定語從句，定語從句that allow the seals to cope with the extreme oxygen deprivation，修飾前面的physiological mechanisms，后面加上定語從句that occurs during its longest dives，修飾前面的名詞，定語從句which can extend 500 meters below the ocean's surface and last for over 70 minutes修飾前面的名詞。

【亮點回放】此句話的亮點是三個連環(huán)定語從句，氣勢磅礴，層層修飾前面，是定語從句中少有的高級句型，作文也可以使用，很經典。

【核心詞匯】

Weddell seal　威德爾海豹

physiological mechanisms　生理機能

oxygen deprivation　缺氧

longest dives　最長時間的潛游

extend　延展

【參考譯文】在實驗室中研究威德爾海豹的實驗描述它們的生理特征，這些特征允許海豹應對極度的缺氧，這種缺氧出現在最長時間的潛游中，這種潛游可以持續(xù)到海平面500米以下而且維持超過七十分鐘。