a double-headed eagle的用法和样例：
- On the basis of research on com harvesters at home and abroad, a double head of picker and forage for sell-walk corn harvester should be designed.
- I do not realize it is a double feature.
- I want a double room with a view.
- He was so fat that he had a double chin.
- Can you tell me the rate for a double room, please?
- A couch performs a double service.