求翻译：and the rolled portion was covered with a blackish film. It was apparent that some circumferential cracks were located on是什么意思？

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and the rolled portion was covered with a blackish film. It was apparent that some circumferential cracks were located on

问题补充：

匿名	2013-05-23 12:21:38 和热轧部分用黑色薄膜覆盖。这是明显的环向裂纹，分别位于

匿名	2013-05-23 12:23:18 并且已回滚部分的是下边的一个电影。显然,一些表面裂缝是位于

匿名	2013-05-23 12:24:58 并且滚动的部分用一部稍带黑的影片报道了。它是明显的一些周围镇压被找出

匿名	2013-05-23 12:26:38 和热轧的部分覆盖着黑色的电影。很明显位于一些环向裂缝

匿名	2013-05-23 12:28:18

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