Down on the ground, and essential to any intersection, is the control box.

控制箱位于地面上，对于任何十字路口来说都是必不可少的。

Mission control said the incident was a mystery but still asked the astronauts to replace the 117-kilogram pump control box that remains the most likely source of the trouble.

太空航行地面指挥中心称这起事故很神秘，但仍要求宇航员取代掉117公斤中的泵控制箱，问题很可能就出现在这里。