grain-density autoradiography颗粒: pellet; bead; dust; anything ...密度: density; thickness放射: radiate; emit; blas; radiati ...自: self; oneself; one's own显影: develop下载手机词典可随时随地查词查翻译关注微信公众号:chachacidian,回复:颗粒密度放射自显影术,即可在微信中查询翻译