self-sealing pneumatic tube system自: self; oneself; one's own密封: seal; seal up; seal airtight ...冷气: air conditioning; cool air管路: pipeline; canal; channel系统: system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:自密封冷气管路系统，即可在微信中查询翻译
