传统的FCM算法对原始图像进行分割，既没有考虑像素间相关性，又没有考虑像素的空间信息，因而对噪声十分敏感而且速度慢。
The conventional FCM algorithm is noise sensitive because of not taking into account the spatial information and the relevant of pixel.
邮箱太大，处理速度慢而且还不可靠。
Our mailboxes were too big for them to handle speedily and reliably.
该过程不仅速度慢，而且代码也难于理解和维护。
Not only is that process slow, but the code is also difficult to understand and maintain.
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