15．Science is m most challenge subject as my studentshave no concept of doing experiments．
科學(xué)是我最挑戰(zhàn)的科目，因為我的學(xué)生沒有做實驗的概念．

分析 根據(jù)中文意思缺了"沒有…的概念"，使用短語have no concept of doing sth．，句子使用的是一般現(xiàn)在時，主語students為復(fù)數(shù)，因此也使用一般現(xiàn)在時．

解答 have no concept of

點評 對于漢譯英這種題，要分析句子意思，再從結(jié)構(gòu)上和意義上對答案進(jìn)行確定．

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