viking lander 2
海盗着陆器2号
以上为机器翻译结果，长、整句建议使用 人工翻译 。
There were three biology experiments on the Viking lander 1 and Viking lander 2.
NPR: Revisiting the Viking Missions to Mars
There have been three successful Mars lander missions, the Viking 1 and Viking 2 in 1976, and the Pathfinder in 1997.
CNN: Mars Pathfinder enlisted in search for lost Polar Lander
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