If you like swimming, set yourself a distance or time challenge.
如果你喜欢游泳的话，给自己设定一个时间或距离进行挑战。
The first point in a set lies at a distance equal to the segment length.
集合中的第一个点位于等于区段长度的第一段距离内。
Add a public field named distance to Point, and set its type to int.
向Point添加名为distance的public字段，并将其类型设置为int。
Add a public field named distance to Point, and set its type to int.
向Point添加名为distance的public字段，并将其类型设置为int。
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