Both rovers have now found evidence of past wateractivity on the planet, NASA announced last week.
上周美国宇航局宣布，两辆火星车现在都已经发现火星上曾经有水存在的证据。
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You also can go to the Summer Palace to swim. It claims to be China's biggest wateractivity center.
您还可以去夏宫游泳。据称，那是中国最大的水上活动中心。
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Scientists believe wateractivity affected this plateau after the formation of the nearby canyons. Although the source of water and sediment remains uncertain.