| | | | 4 | | 1. | | 2. 15-20 | 2 | 3. 4 | | 4. | | | 5. | 6. | 7. | stress | | 8. | | | | 9. 30 | | | | | ▲ | | | ▲ | | ▲ | | | | ▲ | | | 1. | 2. | | 3. | | |