本期内容：

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: 机构；组织
edge towards: 推进；进展
joint mission: 联合任务
sample: 样本
letter of intent: 意向书
feasibility: 可行性

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