A crossroads for students的用法和样例：
- This former Free City of the Empire on the river Main has been a crossroads for European trade for centuries.
- With borders on more than a dozen countries, China has become a crossroad for smugglers of all kinds.
- A town of central Ivory Coast. It was once a crossroads for caravan trade. Population, 230,000.
- They reached a crossroads marked by a signpost.
- The officer reined in his horse at a crossroads.