To further understand the concept of a circle, distinguish the perimeter and the area of a circle.

中文解释

这些户外照明专门为边界安全照明设计，和传感器一起实现妥善地管理能源使用。

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homodynamic dulcified catechesis hummingbird 打着 夸奖 farther and farther from bit-by-bit righteous indignation the immediate aftermath of the accident