It seems possible that a sinkingcurrent of cooled mantle material on the upper side of the plate might be the cause of such deep basins.
看来,板块上侧冷却的地幔物质的下沉流可能是造成这种深盆地的原因。
2
A small current made her feel as though she was sinking into her bed; a little more had her floating close to the ceiling or seeing her legs kicking towards her face.