对准着陆地点的水平推进器。

Horizontal thrusters to align with the landing site.

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当一个新的来访者到达着陆页时，我们把他们随机分配到三个处理水平中的一个：控制水平、A处理水平、B处理水平。

When a new visitor arrives on the landing page we randomly assign them one of three treatments: the control, treatment a, or treatment B.

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其他的处理水平是在当前的着陆页做一些改变。

The other treatments will be variations on that. Here are some things worth testing.

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