double wall containment双层壁: cavity wall安全: safe; secure; safety; securi ...壳: shell; hard surface双层安全壳: double containment vessel双层安全壳壁: double containment wall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:双层壁安全壳,即可在微信中查询翻译