a case study of Nigerian English fiction a case study of Pingshan New District a case study of Xinjiang cotton 文化·历史·现实:尼日利亚英语小说个案研究:a case study of Nigerian English fiction a case study of the gas engineering a case study of grassland circulation a case study of robot application a case study of Tianjin city a case study of Zhangdian town a case study on human genetic information