低速層 [ㄉㄧ ㄙㄨˋ ㄘㄥˊ; di1 su4 ceng2] low velocity zone (seismology) also called asthenosphere 軟流層[ㄖㄨㄢˇ ㄌㄧㄡˊ ㄘㄥˊ; ruan3 liu2 ceng2] ◄ ►