a powder magazine的用法和样例：
- Sinister forces, however, were rapidly transforming Europe into a powder magazine, which would explode on the striking of the small spark.
- He takes a powder every morning.
- He took a powder and left his mother to worry about his gambling debts.
- He took a powder and left his wife to worry about his gambling debts.
- They were sent to reconnoitre the enemy powder magazine.
- A container, such as a powder horn, made from a horn.