四级While two of these ships sank, they were all designed with double hulls (船体) believed to make them "unsinkable", perhaps a mistaken idea that led to the Titanic's and the Britannic's tragic end.

虽然其中两艘沉没，但它们都是双层船体设计的(船体) 人们认为这会使它们“永不沉没”，也许这是一个错误的想法，导致了泰坦尼克号和不列颠号的悲剧结局。

2018年6月大学英语四级真题（第2套)