permanent commission for the safety of air navigation空: leave empty or blank; empty; ...导: lead; guide安全: safe; secure; safety; securi ...常设委员会: permanent committee美洲社会安全常设委员会: iacss; inter-american permanent committee on social 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:空导安全常设委员会，即可在微信中查询翻译
