基础研究具有探索性、高风险、长周期和经济效益模糊的特点。
It is characterized by being explorative, high risk, long term and vague economic benefit.
西方人普遍认为中国人的交际行为具有间接性和含义模糊的特点。
Westerners often misunderstand Chinese culture of communication. They hold that the Chinese mode of communication is indirect and implicit.
本文针对密度控制的特点，采用模糊pid控制策略。
A fuzzy and PID control method is presented for characteristics of density control system.
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