The definition of compound system was given including native system and human system. The definition of certain system and uncertain system were presented.
给出了包含自然系统和人为系统的复合系统定义，以及确定性系统、不确定性系统的定义。
Various opinions of definition before and after 1999, number of digits of significant figures and digit number s of uncertain figure s viz.
总结了1999年以前和以后有效数字的定义、有效数字位数、有效数中包含的不确定数字(即文献上称：“存(可)疑数字、或估计数字”)的位数等不同的观点。
The scientific and philosophy location of complexity concept was discussed, and a definition was given that" there are many distinguishable states that are meaningful, uncertain and nonperiodic".
讨论了复杂性概念的科学及哲学定位，给出复杂性概念的一个界定：“存在多个有意义、不确定、非周期的可区分状态”。
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