It is a temporal relation between the event time and the speech time or another reference time, and can be obtained by time phrase parsing of Chinese text.

时制是时间信息的重要组成部分，需要在篇章中通过时间短语的语义分析获得。

youdao

In this paper, we analyze the key techniques for the service precision of Global Navigation satellite System such as time reference, time synchronization, satellite orbit determination, etc.

对影响导航定位系统定位精度的各种因素进行了分析。研究了影响导航定位精度的关键技术问题，如时间基准、时间同步和卫星定轨等。

youdao

In this paper, we analyze the key techniques for the service precision of Global Navigation satellite System such as time reference, time synchronization, satellite orbit determination, etc.

研究了影响导航定位精度的关键技术问题，如时间基准、时间同步和卫星定轨等。

youdao

"He was young and I had a very good time drawing his picture because I used a lot of reference material that were paintings made of him at different times in his life.

VOA: special.2009.02.27

I'll say more about this next time with reference to Yeats's late poetry.

下次我会多谈些这方面的,关于叶芝晚期诗歌的内容。

耶鲁公开课 - 现代诗歌课程节选

Undefined reference, what was the solution last time?

未定义的引用，上次我们是怎么解决的呢？

哈佛公开课 - 计算机科学课程节选

Money should be used for a proper economic purpose and not treated as a commodity on which a return can be made by reference to time.

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The whole idea of replacing the watch with a band that acts as a mobile computer would be interesting, for the very fact that it would replace the real estate (our wrists) once used for a single point of reference on time.

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And does this time reference coincide with your recollection as to when you received calls from Ms. Lewinsky on this particular day?

CNN: Transcripts from video deposition of Lewinsky, Jordan, and Blumenthal