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13．The gravity on Mars is onlythree eighths （八分之三） of that on the earth．

分析火星上的地心引力只有地球的八分之三．

解答答案：three eighths．
根據提示漢語結合語境推測句意是"火星上的地心引力只有地球的八分之三．"，分數表達法是：分子用基數詞，分母用序數詞，如果分子大于1，分母要加-s，所以八分之三的正確表達為：three eighths．所以答案是：three eighths

點評做這類題型，首先根據所給漢語明確句子所要考查的單詞或短語的拼寫，再結合相關語法知識對單詞或短語做出形式上的變化．

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