primary radiation初级: elementary; primary; junior; ...放射: radiate; emit; blas; radiati ...初级放射性同位素: primary radioisotope次级放射: secondary radiation次级放射病: secondary radiation sickness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:初级放射,即可在微信中查询翻译