ravelling

1. The majority of subgrade subsidence, erosion, collapse, pumping, asphalt pavement ravelling, peeling, cracking and so on, are relevant to the erosion of surface water and underground water at varying degrees.
   大多数路基沉陷、冲刷、坍塌、翻浆，沥青路面松散、剥落、龟裂、车辙等，都不同程度地与地表水和地下水的侵蚀有关。
2. Therefore, the part is going to explore the trajectory formation and evolution of the aesthetic thought through five phases, such as his twice ravelling Europe, teaching in Peking University, sojourn at Shanghai, ect.
   所以，本部分从张竞生两度旅欧、北大任教、旅居上海等五个阶段探究其美学思想形成演变的轨迹。

noun

1. a bit of fiber that has become separated from woven fabric

   Synonym:    raveling