a selfish and vacuous life的用法和样例：
- A selfish person always thinks about himself.
- I have been a selfish being all my life, in practice, though not in principle.
- A selfish and designing nation obsessed with the dark schemes of European intrigue.
- It all adds up to this-he is a selfish man.
- Amid growing dissatisfaction with his performance, Chen has fully exposed his nature as a selfish and immoral politician.