盾构施工法是城市地铁区间隧道施工的主要方法之一。
Shield construction method is one of the main methods of interzone tunnel construction in urban underground.
地铁区间联络通道由于受空间限制，其施工相当有难度。
The construction of metro section connecting passages is quite difficult due to space limitation.
成都南部地铁区间采用地面开口的自然通风方式，在国内尚属首次。
It is the first time in China that natural ventilation modes with ventilation openings on the ground surface are used in the southern section of Chengdu Metro.
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