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    9．在中国，科学家则把精力集中在克隆动物以及干细胞上．
    In China，scientists havefocused/concentrated their effortson cloning animals，as well as cloned tissues．

    分析 在中国，科学家则把精力集中在克隆动物以及干细胞上．

    解答 答案：focused/concentrated；on
    解析：根据中文及所给英文题干可知，本题考查focus/concentrate one's effort（s）on doing sth"集中精力做某事"这一固定短语；另外根据have可知本句为现在完成时．综上，本题答案为：focused/concentrated；on．

    点评 本题考查句子翻译，做此类题目时一定要根据中文及英文题干确定需要翻译的成分，再找出与之对应的英文并考虑各成分是否有形式的改变．

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