1. If you are not washing your hair enough, greasiness can cuase a scalling problem which affects growth.
   如果你不经常洗头发，油脂导致的结垢将影响头发的生长。
2. Slab temperature variation entering the mill would be closely controlled, and exposure to air and consequent scalling would be minimized.
   由于板坯进入轧机后温度受到严格控制，暴露在空气中的部位极少，因而可将氧化铁皮减少到最低程度。

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