20．那位科學(xué)家認(rèn)為還要好幾年這個理論才能付諸于實踐．（before）The scientist believes that it will be years before the theory is put into practice．．

分析 The scientist believes that it will be years before the theory is put into practice．

解答 The scientist believes that it will be years before the theory is put into practice．
這是對事物的一種個人的看法，所以主句用一般現(xiàn)在時，從句可使用一般將來時．
本句可使用句型 it will be years before要過多久才…；believe后面跟一個that引導(dǎo)的賓語從句，put sth into practice將…用于實踐中．

點評 翻譯題在解題是首先要確定好句子的時態(tài)，然后要把握好短語表達(dá)，最后要注意句子結(jié)構(gòu)．

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