The picture for which he paid $1,000 was once owned by a duke.

　　他花了1000美元買下的畫曾為一名公爵所擁有。

　　Crusoe's dog, which was very old now, became ill and died.

　　克魯索的狗，現(xiàn)在已經(jīng)很老了，病死了。

　　Edison built up a factory which produced things that had never been seen before.

　　愛迪生辦了一個工廠，生產(chǎn)過去從未見過的東西。