Viking 1 landed on Mars in 1976 and just a few months later, Viking 2 landed also on Mars.

海盗1号飞船于1976年登陆火星，仅仅几个月以后，海盗2号飞船也登陆火星。

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Shortly after Viking 1 landed on Mars on July 20, 1976, its Camera 2 captured the first photograph ever taken of the planet's surface.

1976年7月20日，海盗- 1号抵达火星不久，其2 -摄像机就抓拍到有史以来第一张火星全景图。

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Here is one of the Viking Islands. The plain lowland at sea level is their habitat. They grow in altitude of 2-20 meters from sea level, all day full direct sunlight.

此地就是具有维京猪的岛屿之一，他们的栖地位于约海拔2 ~ 20公尺的低地，接受全天的日光直射。

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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

There were three biology experiments on the Viking lander 1 and Viking lander 2.

NPR: Revisiting the Viking Missions to Mars

In addition, the team has located all three of the other successful Mars landers, including Viking Lander 2 whose discovery was also announced on May 5th.

ECONOMIST: Has a missing Martian probe been spotted?