2．They are discussing the strengths and weaknesses of the diet．

分析 他們正在討論這種飲食方式的優(yōu)缺點．

解答 答案：strengths．
分析句子的內容可知，本句需要一個名詞和weaknesses一起用作discuss的賓語，而且使用的是復數(shù)形式，故答案為strengths．

點評 做翻譯填空的題目要注意解題步驟：1．分析每道題目需要完成部分的語法屬性　2．劃出已給出部分的中心詞．依據(jù)空格前后成分，確定空格的語法屬性：詞性、單復數(shù)、時態(tài)等．

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