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本期內容：
The US and European space agencies are edging towards a joint mission to bring back rock and soil samples from Mars. Nasa and Esa have signed a letter of intent that could lead to the first "round trip" to another planet. The move was announced as a meeting in Berlin, Germany, discussing the science goals and feasibility of the mission.
agency: 機構；組織
edge towards: 推進；進展
joint mission: 聯合任務
sample: 樣本
letter of intent: 意向書
feasibility: 可行性
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