对于经络现象的结构实质研究，遇到了困难，原因在于人们对于经络结构认识的局限。
Due to the limited cognition of meridian structure, the study of the essence of meridian phenomenon is faced with obstruction.
由于受建设时期技术条件和认识的局限，其制酸装置的中、低温位余热回收不够完善。
Due to the limitations of technical conditions and knowledge, at that time they didn't set low-grade heat recovery system in the process of acid.
生活通过思想展现魅力。思想作为理性认识的最高形式，超越了感性认识的局限，能自觉追问和自为创造。
Life exhibits its fascination by the thought which is the highest form of the rational cognition transcending sensible cognition and can question and create self-consciousness.
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