in a swimming pool意思为在(一个)游泳池里,是个介词短语。介词短语可以用来做表语,后置定语,宾语补足语和状语等成分。
表语 He is in a swimming pool.
他在泳池里
后置定语 The boy in a swimming pool is my friend.在泳池里的那个男孩是我朋友。
宾语补足语 With a necklace in the pool,he was excited.他很兴奋,因为有根项链在水里。
状语 He is swimming in a swimming pool.他正在泳池里游泳。
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