But this time, rather than just making a single pass by Mars Mariner 9 was engineered to orbit the planet for weeks and do a complete mapping.

但是这时，舍弃了仅仅经过火星，水手9号被制造成围绕火星几个星期，做一个完整的绘图。

So I do a single pass and I do it along the length of the lime and I'm rolling the lime along the length here and then I'm turning with my fingers as I go.

所以我做了一次，我沿着石灰的长度做，我沿着这里的长度滚动石灰，然后我边走边用手指转动。