Is that why they're constructing so many underpasses, overpasses and highways?那就是他们建这么多天桥 、 地下通道和公路的原因 吗 ?I also find more overpasses and elevated highways have been built.我也发现建造了更多人行天桥和高架道路.Avoid stopping near or u...

v.发现( discover的现在分词 )，碰见，撞见，了解到...