This is beneficial when the dataset is large and the frequency of queries that request the area of a circle is high.
如果数据集较大，或者经常发出请求圆面积的查询，那么创建函数索引将有助于提高性能。
Performing high frequency eddy current inspection of area around skin cutout and make sure that no crack existing.
对蒙皮切口周边区域做高频涡流探伤检查并确定无裂纹存在。
Signal is in low frequency, while noise in high frequency and minutia in image is also in this area.
信号主要分布在低频区域，而噪声主要分布在高频区域，同时图像的细节也分布在高频区域。
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