鲸的身体部位: tail fluke, skin, flipper, head, blowhole, big tooth 海洋中的动物: sperm whale,squid,octopus,shark,skate,dolphin 与地理有关的词: equator, tropical, subtropical,Antarctica 表示重量的词: ton,pound tend to 有·.....的倾向;倾向于 make up 组成;补足 according to 依照;按照 or so 大约;左右 in search of寻找;寻求 anumber of一些;许多 it 作形式主语的用法，例如: t is amystery why they do this. 状语从句的省略用法，例如:When attacked,sperm whales form acircle to protect the sick and young whales. while 引导的并列结构表示对比，例如: They play on the surface ofthe water while older whales are diving