At the southern edge of the North China Plain lie the Qinling Mountains.
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重点讲解:
a maze of
(街道、房间、地道)错综复杂;迷津;
eg. The tented ceiling hides a maze of water pipes.
形似帐篷的天花板上隐藏着迷宫似的水管。
eg. I followed him through a maze of narrow alleys.
我紧随他穿过一条条迂迴曲折的窄巷。