A substance, especially an adhesive agent such as wax or putty, used to close or secure something or to prevent seepage of moisture or air.

封口之物：一种物质，尤指似蜡或油灰的粘性剂，用来封闭、保存某物或防止潮气或空气的渗流。

youdao

Compared to something you possess or something you know, these characters are inherently secure for they are unique in you and hard to be forged.

与人所持有的证件和所拥有的知识相比，生物特征具有与生俱来的唯一性和安全性。

youdao

Or perhaps you'll spot a sublet or other temporary living situation with a move-out date that gives you enough time to secure something more permanent.

FORBES