a heavy sleeper的用法和样例：
- I'm such a heavy sleeper that the explosion didn't wake me.
- Mrs Fairfax is a heavy sleeper, like most old people, and didn't hear anything.
- There was little fear of Sir Michael's awaking for some time, as he was a heavy sleeper in the early part of the night, and had slept more heavily than usual since his illness.
- Khruschev was a heavy sleeper.
- He lugged a heavy handcart along.