本底辐射 běn dǐ fú shè

DEFINITIONS

  1. background radiation

CHARACTERS

本 běn
HSK 1
root, origin, source; basis
底 dǐ
HSK 4
bottom, underneath, underside
辐 fú
HSK 6
spokes of wheel
射 shè
HSK 5
shoot, eject, issue forth, emit