引用
This segment should take about 55 minutes. It contains:
| Slide | Duration |
|---|---|
| 共享引用 | 10 minutes |
| 独占引用 | 5 minutes |
| 切片 | 10 minutes |
| 字符串 | 10 minutes |
| Reference Validity | 3 minutes |
| 练习：几何图形 | 20 minutes |
This segment should take about 55 minutes. It contains:
| Slide | Duration |
|---|---|
| 共享引用 | 10 minutes |
| 独占引用 | 5 minutes |
| 切片 | 10 minutes |
| 字符串 | 10 minutes |
| Reference Validity | 3 minutes |
| 练习：几何图形 | 20 minutes |