/?ɡ?s ?nd ?er/(USnitrous oxide)amixtureofoxygenandnitrousoxide(= agaswith asweetsmell), that can bebreathedin toreducepain, forexampleduringchildbirthormedicalexaminations:麻醉混合气(氧气和一氧化二氮的混合物,吸入可减少疼痛,用于分娩或医疗检查等)Hospitals havegasandair, which isinhaledand can be used at anytime.医院有麻醉混合气,可以随时吸入使用。Gas andaircan be used from theonsetofyourlabour.麻醉混合气可以从分娩一开始就使用。More examples
He gave megasandairbut thepainjust gotworseandworse.
Itriedsomegasandairbut that made mefeelsick.
I onlyneededgasandairand aninjectionof pethidine forpainrelief.
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Obstetrics: birth(Definition ofgas and airfrom theCambridge Advanced Learner's Dictionary & Thesaurus? Cambridge University Press)#https://dictionary.cambridge.org//dictionary/english/gas-and-air##