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。

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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