How was the gap between a walking mammal and a swimming whal

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How was the gap between a walking mammal and a swimming whale bridged?请问bridged什么意思?
How was the gap between a walking mammal and a swimming whale bridged?Missing until recently were fossils clearly intermediate,or transitional,between land mammals and cetaceans.请问bridged什么意思,为什么放句末,后面一句结构不明白,用软件翻译给我的别填,用网上已有的回答敷衍的也别填,浪费你我的时间,

我觉得应该是：有一定差异的陆地上爬行的哺乳动物和一头海中游泳的鲸鱼是怎么被联系到一起的?bridge是桥的意思,这里用bridge名词活用作动词,意思从“桥”变为“联系,连接”,意思明白之后把原词放入句子中,发现这里的gap应该是. 被.联.系. 所以用了被动语态
至于为什么放在句尾,如果我把句子改成： How did people bridge the gap between a walking mammal and a swimming whale? 你再对比一下原句应该就能明白了,没有什么绝对的道理,只不过把被动的过去分词后置了,强调了被联系起来的两个事物.
至于后一句我如果改写成： Missing until recently, fossils were clearly intermediate or transitional between land mammals and cetaceans.明白没?用了倒装了~~ 而且加了没有实际意义的逗号.

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