blow off a roof的用法和样例：
- I'm afraid that the wind might Blow off the roof.
- He bit off a large piece of the apple.
- Parents must let children blow off steam sometimes.
- His inability to feel pain enabled him to place knies through his arms and walk on burning coals. (The young boy died before his fourteenth birthday from injures sustained after jumping off a roof.
- To deflect or ward off a thrust or blow.