additional duty of teaching的用法和样例：
- In Hesiod's works, at least, she had the additional duty of carrying water from the River Styx in a ewer whenever the gods had to take a solemn oath.
- Legislation is the duty of a congress.
- It's the duty of the police to preserve the public order.
- I prefer this system of teaching English.
- Have you had any experience of teaching English?