背: body's back砂: sand; grit填砂，背砂: filler sand底砂 背砂 填砂: floorsand地面砂，背砂: floor sand背山: brokeback mountain; seyama背僧面猴: bearded saki背山脊，屋脊: ridge背散射紫外线光谱仪: backscatter ultraviolet spectrometer背山麻杆: alchornea trewioides背散射系数: backscattering coefficient背山面海: (the buildings) face the sea with the hills for a background背散射谱: rbs背山面水: fronting water and with hills on the back背散射光: backscattered light
