18．The researchers hope their newdiscoveries（發(fā)現(xiàn)） can be used to make objects that are difficult or impossible to replace．

分析 研究人員希望他們的新發(fā)現(xiàn)可以用來制造那些難以或不可能取代的物體．

解答 答案：discoveries 考查翻譯填空．根據(jù)句意：研究人員希望他們的新發(fā)現(xiàn)可以用來制造那些難以或不可能取代的物體．new后面要用名詞，發(fā)現(xiàn)用discovery，結(jié)合句意要用復(fù)數(shù)形式discoveries

點評 考查翻譯填空．解答此題的關(guān)鍵是根據(jù)語境推測要填內(nèi)容表達(dá)的含義，然后用合適的詞的形式完成句子．

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