primary work短语¹⁴⁴⁹⁷²⁺² 基本例句 经初步工作 Objective:To explore the expression series of ID4 gene in normal and malignant tissues or cells as a primary work for studying the regulation mechanism of ID4 gene. 目的:分析ID4基因在正常组织细胞和癌变组织细胞中的表达情况,为研究该基因的表达调控机制奠定基础。 cnki