两年之后，极地登陆者号却在着陆时迷失了。

Two years later, the Polar Lander was lost during landing.

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为了增加覆盖率，除了陆上电话局抽取的样本外，调查者还随意拨打了一些手机号，并把两种样本结合起来统计。

To increase coverage, this land-line sample was supplemented by respondents reached through random dialing of cellphone numbers. The two samples were then combined.

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“勘测者3号”两年前在右下角的黑点处着陆。

Surveyor 3 had landed two years earlier in the dark smudge at lowerright.

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