2. It also includes 246 residences, that form an
arc that covers the open market area.
还包括的246所住宅,形成一个弧形覆盖了整个公共市场领域。
3. The data structure contains members which specify whether the segment is an
arc or a straight line, the length of the segment, and its starting position.
这个数据结构包含了这些成员变量:强调线段是弧线还是直线的成员变量,线段的长度,以及线段的开始位置。