剑桥4-Test1-section2
今天一鼓作气来它两篇。
1.Some of the senses that we and other terrestrial mammals take for granted are either reduced or absent in cetaceans or fail to function well in water.
【又选自文章的首句！是由either..or..or 连接的句子。be reduced,be absent ,fail to function写了海洋动物鲸在水里各项器官的一个状态-degenerate退化。terrestrial mammals 陆地哺乳动物，take for granted 当成理所当然。造句：some education facilities in our school we take for granted are lacking in Africa.】
2.It has been speculated that,as the blowholes evolved and migrated to the top of the head ,the neural pathways serving sense of smell may have been nearly all sacrificed.
【it 做形式主语的典型句式，类似开头的有：It's bee said that~；speculate预测；evolve 进化；migrate移动；neural pathways 神经系统；sense of smell /taste/touch/vision/hearing嗅觉/味觉/触觉/视觉/听觉；be sacrificed 牺牲】
3.This contact may help to maintain order within a group,and stroking or touching are part of the courtship ritual in most species.
【stroke 表示抚摸和touch同意思。courtship ritual表示求偶行为，原来鲸是通过触觉求偶，长见识了。】
4.Such variation can no doubt be explained with reference to the habitats in which individual species have developed.
【variation表示变异，with reference to 关于，依据。habitat栖息地。】
5.Such weaknesses are more than compensated for by cetaceans well-developed acoustic sense.
【more than 多于，acoustic听觉的，相当于hearing sense，因为compensate 理解的不到位，整句话表意不明白。】
图片发自简书App
End：我是连鲸和豚都分不清的人，让小朋友说说他喜欢的海底动物，这家伙，不知不觉说了70个品种。他的最大梦想是看遍世界所有动物，祝福他！
