1. Rainwater cannot sink into the ground because of the buildings, roads, and parking lots.
    由于建筑物、道路和停车场, 雨水无法渗入地下。

2. It has great gateways which connect the main roads of north China.
    长城有许多关口, 这些关口与华北的主要道路相连.

3. It has great gateways which connect the main roads of north China.
    长城有许多关口, 这些关口与华北的主要道路相连.

4. It has great gateways which connect the main roads of north China.
    长城有许多关口, 这些关口与华北的主要道路相连.