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Inthelargestcaravels,twomainmastsheldlargesquaresailsthatprovidedthebulkofthethrustdrivingtheshipforward,whileasmallerforwardmastheldatriangular-shapedsail,calledalateensail,whichcouldbemovedintoavarietyofpositionstomaneuvertheship.

Inthelargestcaravels,twomainmastsheld1largesquaresailsthatprovided2thebulkofthethrustdrivingtheshipforward,[while]asmallerforwardmastheld3atriangular-shapedsail,calledalateensail,whichcouldbemoved4intoavarietyofpositionstomaneuvertheship.（从句结构、平行并列结构、分词结构）

全句共有4个谓语动词，主句谓语动词为held1和held3，两者由[while]连接，为平行并列关系。that引导定语从句修饰largesquaresails。现在分词driving作后置定语修饰thebulkofthethrust，过去分词called作伴随状语。which引导非限定性定语从句。原句可拆分为：

①Inthelargestcaravels,twomainmastsheld1largesquaresails[while]asmallerforwardmastheld3atriangular-shapedsail.（主句）

②thatprovided2thebulkofthethrustdrivingtheshipforward.（定语从句）

③whichcouldbemoved4intoavarietyofpositionstomaneuvertheship.（非限定性定语从句）

翻译：

最大型的轻快帆船上，两根主桅杆撑起大块船帆就能够提供足够的推力驱动帆船前进，同时一个小型的前桅杆撑起一块三角形船帆，这种船帆叫做三角帆，它可以移动到不同位置控制帆船。

练手题：

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