One idea is that these slope lineae could be formed by the flow of liquid water.

一种想法是，这些斜坡线可能是由液态水的流动形成的。

We do see these dark streaks on some hillsides that we call recurring slope lineae.

我们确实在一些山坡上看到了这些黑色条纹，我们称之为反复出现的坡度线。

When they do this, the martian dust gets dark, a darkness we can see, and that was first spotted in 2011 and named recurring slope lineae.

当他们这样做时， 火星尘埃变暗，我们可以看到这种黑暗， 它于 2011 年首次被发现， 并命名为循环斜坡线。