We will use this function to check every portion of the source area for motion.
我们将使用这个函数检查源区域的每个部分，从而判断是否有运动。
The protective measure was put forward for the water source area.
提出了该水源保护措施。
That is, the source area is clipped to fit the current screen buffer.
也就是说，会将来源区域加以裁剪，以适合目前的萤幕缓冲区。
That is, the source area is clipped to fit the current screen buffer.
也就是说，会将来源区域加以裁剪，以适合目前的萤幕缓冲区。
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