“barrier methods”的概念、定义、翻译、参考文献-科学参考

单词	barrier methods
释义	barrier methods Encyclopedia 医学外用避孕释 barrier methods外用避孕用物理方法（机械阻挡）不让精子到达子宫腔内，或用化学制剂在阴道内灭活精子，也可两者结合，以此阻挡精、卵相遇而避孕的方法。
随便看	ground level event ground level event of solar cosmic ray ground line ground literal ground maintenance support for flight test ground meristem ground mobile mapping ground model ground motion ground nadir point ground navigation phase ground object reflectance spectrum curve ground object spectrum ground object spectrum characterization ground oil storage tanks ground operation and control system ground operator of unmanned aerial vehicle ground penetrating radar ground plane ground positioning orientation and aiming system ground power supply and distribution test equipment ground pressure ground pressure around openings ground pressure around shaft ground pressure in stopes

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