retaining structure短语¹⁴⁴⁹⁷²⁺² 基本例句 支护结构 In addition, the structural connection of underground and elevated section, and the retaining structure connection of underground running tunnel and underground station are presented. 地下区间敞开段与高架区间的结构衔接、地下区间与地下车站的围护衔接。 cnki