低速層 dī sù céng

DEFINITIONS

  1. low velocity zone (seismology)
  2. also called asthenosphere 軟流層|软流层[ruan3 liu2 ceng2]

CHARACTERS

低 dī
HSK 4
low; to lower, hang, bend, bow
速 sù
HSK 4
quick, prompt, speedy
層 céng story, layer, floor, stratum