stratification层: I storey; tier; stratum形成: form; take shape; shape; for ...边界层形成: boundary layer build-up表皮层形成: cuticularization电离层形成: formation of ionosphere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:层形成,即可在微信中查询翻译