This activity is very useful if you need to provide a cancellation function in your process.
如果您必须在流程中提供取消功能，那么该活动将非常有用。
This function is very useful in situation like a group of soldier that runs in a battle.
这一个功能是非常有用的在同类情形中一群军人以在一场战争中跑。
This is a Tetris game, pulling to achieve the main function, the interface is nice, very useful for beginners.
说明：这是一个俄罗斯方块游戏，实现拉主要的功能，界面好看，对于初学者很有用。
This function create ellipse around desired image which has two choices. automatic and manual, it is very useful.
这个函数创建了所需的图像有两个choices.automatic和手动椭圆形，它是非常有用的。
This function create ellipse around desired image which has two choices. automatic and manual, it is very useful.
这个函数创建了所需的图像有两个choices.automatic和手动椭圆形，它是非常有用的。
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