词汇	buiding block
释义	buiding block 结构单元
随便看	density of runs density of scanning density of scanning lines density of seam density of sea water density of seed density of seed bank density of serous fluid density of setting density of settlement density of shallow layer densityof shops density of shops density of signed measure density of simultaneous distribution Density of smoke and dust density of snow density-of-snow gauge density of soil density of solid particles density of soundings density ofspectnma density of spectral line density of spot seeding density of stand