历时

历时 refers to the duration or length of time that something takes. It emphasizes the time span between the start and end of an event, process, or action.

The character 历 (lì) originally meant 'to go through' or 'to experience,' and it often relates to time or events. 时 (shí) means 'time' or 'moment.' Together, 历时 suggests the passage of time or the time required for something to occur.

历时常用于描述项目、活动或过程所需的时间长度，例如在工作计划或科学研究中。它也可以用来形容某种状态或现象持续的时间。在日常交流中，这个词常用于正式或书面语境。