hermetically
adv. 密封地，不透气地；炼金术地
例句
The batteries are designed to be leak-proof and hermetically sealed.
这些电池的设计防渗漏，且密封性强。
《柯林斯英汉双解大词典》
The containment structure is a hermetically (air tight) sealed, very thick structure made of steel and concrete.
它是高度密封，用钢铁和混凝土制成的非常厚的壁障。
The third containment is a hermetically (air tight) sealed, very thick bubble of the strongest steel and concrete.
第三个容器是严格密封的，用很厚的钢铁和混凝土打造的气泡状容器。
