However,unlike the cases of sea otters and pinnipeds (seals,sea lions,and walruses,whose limbs are functional both on land and at sea),it is not easy to envision what the first whales looked like.unlike 整个句子是做的什么成分? 英语
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【答案】 unlike介词 prep.,就像with一样,引导原因状语.连词,介词,形容词,等等都可以引导状语从句.介词是一种用来表示词与词,词与句之间的关系的词.在句中不能单独作句字成分.介词后面一般有名词代词或相当于名词的其他词类,...