first class certificate一级: one-level; Class A; senior g ...证券: bond; security; negotiable s ...一级证书: first choice certificate初级证券: primary securities次级证券: junior security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:一级证券,即可在微信中查询翻译