Were they.虛擬倒裝表示假設(shè),and if so,強(qiáng)調(diào),如果確實(shí)如此,
If they were salt domes such as (what) are common along the United States Gulf Coast, and if so, why should there have been so much solid crystalline salt beneath the floor of the Mediterranean?
如果它們確實(shí)是美國(guó)墨西哥灣地區(qū)常見的一種鹽丘,那么為什么地中海大陸層下面會(huì)出現(xiàn)過(guò)那么多固體的晶鹽