Climatologists have been tracing an el nino a usually warm Pacific Ocean current that occurs periodically and often causes catastrophic weather condition.
气候学家一直在跟踪厄尔尼诺，既一种异常温暖的，定期发生并经常带来灾害性天气的太平洋洋流。
2
In this paper, sequence pseudo orbit tracing property is defined, and a sufficient condition on topological transitivity is given.
给出序列伪轨跟踪性的定义，得到拓扑可迁的一个充分条件。
3
To understand the social disability condition and its causes for patients with psychosis. Tracing investigations of social disability were made in 1367 admitted patients in our hospital during 1998.