complex patterns短语¹¹⁴⁴⁶⁷⁺⁴ 基本例句 复杂模式 Being the sources of the Yangtze River, Yellow River and Lanchang River, Qinghai province is featured with severe water, wind and frozen erosion, which often happen in complex patterns. 青海省是长江、黄河、澜沧江的发源地，水蚀、风蚀和冻融侵蚀都较严重并呈复合型出现。 cnki