a first-aid bandage的用法和样例：
- They built a First Aid Post on the beach.
- A first aid kit should be brought along for emergency purpose.
- Jennifer suggested that Colin should take a first aid on his trip.
- A first adier may be responsible for more than one first aid kit.
- But they say you may occasionally find illegal factories where you can buy a First Aid Tent, a Ballista and an Arrow Train, all in one go!