15．His friends were enthusiastic and encouraged him to publish his ideas，but Copernicus wascautious（謹(jǐn)慎的）．

分析 他的朋友很熱忱，鼓勵(lì)他發(fā)表他的想法，但是Copernicus很謹(jǐn)慎．

解答 答案：cautious
解析：根據(jù)括號(hào)內(nèi)所給中文提示可知，本題考查cautious"謹(jǐn)慎"的一詞．

點(diǎn)評(píng) 本題考查句子翻譯，做此類(lèi)題目時(shí)一定要根據(jù)中文及英文題干確定需要翻譯的成分，再找出與之對(duì)應(yīng)的英文并考慮各成分是否有形式的改變．

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