hermetic
这些玻璃罐是密封的,可以长期保存食物。
These glass jars are ___hermetic, perfect for long-term food storage.
这个神秘社团的活动对外界保持着绝对的秘密。
The activities of this ___hermetic society remain completely secret to outsiders.
档案管理员将这件脆弱的中世纪羊皮纸放入密封的展示柜中以遏止进一步损坏。
The archivists placed the fragile medieval parchment inside a ___hermetic display case to halt further deterioration.