Senses
时效/ 時效 period of effectiveness
The amount of time during which something is effective, valid, or viable; timeliness.
时效/ 時效 statute of limitations
(law) The period of time within which a legal right must be exercised or a crime prosecuted.
时效/ 時效 aging
(metallurgy) The process of changing a metal's properties by holding it at a certain temperature for a length of time.
References
No references for this word.