1. Doors connect the train tunnels to the smaller tunnel every quarter mile and provide escape routes.
    每隔四分之一英里就有出口接通火车隧道和小隧道，提供安全通路。

2. Connect me with Chicago.
    将芝加哥与我接通。

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.

5. 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.

6. In some cities, the bicycle paths connect every area to every other area.
    在有些城市，自行车道把所有地区都连接在一起了。