The deposits spread for 100 kilometers across four counties.

矿藏绵延一百公里, 跨越四个。

Bright ejecta rays such as these are produced as impacts excavate and eject relatively unweathered subsurface material.

放射状石坑产生于天体撞击溅出的地下物质，绵延在遍布石坑的水星表面数百公里。