漫谈美职棒系列暂告一段落，感谢各位支持。出一试卷以激发诸位主动学习的热情，请自测。

请解释以下专用术语。

1. Strike zone. (2 points)
2. Strike out. (2 points)
3. Strike out swinging. (3point)
4. Strike out looking. (3point)
5. Ground out. (5 points)
6. Fly out. (5 points)
7. Sacrifice fly. (4 points)
8. Sacrifice bunt. (4 points)
9. Intentional walk. (2 points)
10. Double play. (5 points)
11. Line drive. (5 points)
12. No hitter. (7 points)
13. Full count. (8 points)
14. Switch hitter. (10 points)
15. Fielders’ choice. (10 points)
16. ERA. (15 points)
17. RBI. (10 points)

附 加题：
1. Charge (Charge the ball). (5 points)
2. Hook (Hook the ball). (5 points)