The cross section of the fibres changes from kidney shaped to circular. This is because the fibres swell markedly when treated with a concentrated sodium hydroxide solution.
纤维交叉的区域由腰子的形状变成圆形，这是因为纤维在经过浓缩的氢氧化钠的作用下明显地膨胀了。
The cross section of the fibres changes from kidney shaped to circular. This is because the fibres swell markedly when treated with a concentrated sodium hydroxide solution.
纤维交叉的区域由腰子的形状变成圆形，这是因为纤维在经过浓缩的氢氧化钠的作用下明显地膨胀了。
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