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1·During the 1840s, Marx and Engels wrote a book together.

19世纪40年代期间，马克思和恩格斯一起写了一本书。

2·At the same time, his close friend, Engels, often wrote to praise him for his hard work in learning English.

与此同时，他的密友恩格斯经常写信表扬他努力学习英语。

3·Marx and Engels is a good friend.

马克思和恩格斯是好朋友。

4·Engels was an enigma.

恩格斯是一个迷。

5·Engels is the best friend of Marx.

恩格斯是马克思最好的朋友。

6·Authors: Karl Marx and Freidrich Engels.

作者：卡尔·马克思；弗里德里希·恩格斯。

7·Marx and Engels shared essentially the same goal.

马克思、恩格斯在本质上也共有这同一个目标。

8·Neither Marx nor Engels nor Lenin was like that.

马克思、恩格斯、列宁都不是这样。

9·Marx and Engels had original ideas of the state.

马克思与恩格斯对于国家有独创的见解。

10·In 1844 Engels met Marx, and they became friends.

1844年恩格斯与马克思相遇并成了朋友。