原因。

　　thus, this is the reason why i caught a bad cold.

　　(46) 所以，我们应该了解…

　　therefore, we should realize (that)…(从句)

　　例如：所以，我们应该了解学英文不能没有词典。

　　therefore, we should realize that in learning english we can not do without a dictionary.

　　(47) 因此，由上面的讨论我们可以明了…

　　we, therefore, can make it clear from the above discussion (that )…(从句)

　　例如：因此，由上面的讨论我们可以明了，坚持不懈可以克服任何困难。

　　we, therefore, can make it clear from the above discussion that perseverance can overcome any difficulty.

　　(48) 从…观点来看, …

　　from the … point of view, …

　　例如：从政治的观点来看，这是一个很复杂的问题。

　　from the political point of view, it is very complicated problem.

　　4. 书信写作常用的惯用语

　　(49) 在信的开头常用以下客套话：

　　how are you?

　　how are you getting on recently?

　　how are you getting on/ along with &helli

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