And as the polar, a year only black and white and two days, such as the equator line, a year only the rain season two, a dry time be spun, fatigue and hopelessness became theme.
而如南北极，一年只有黑白两天，如赤道线，一年只有雨旱两季，时光一被拉长，疲劳和无望便成了主题。
2
The reasons for tar formation from polyacrylonitrile-based carbon fiber were analyzed from the structure and the production line, from as-spun fiber, pre-oxidation to carbonization.