Practice mode with repeatable sections

[Zhuym07]

Is your feature request related to a problem? Please describe. 练习某些交互时想重复练习某段，只能重开一盘新游戏之后重复打前面的部分 Describe the solution you'd like 添加重复练习功能，类似英语磁带的重复某句 以下为UI举例