然而，超声波检测结果表明，对于穿着高跟鞋的人来说，构成腓肠肌的肌纤维长度平均比通常情况短13%。
However, ultrasound revealed that the muscle fibres that make up the calves were indeed 13% shorter, on average, for the heel fans.
木纤维长度、直径、双壁厚、长径比均随着树龄的增加而增加，其平均值分别为891。
The fiber length, diameter, cell wall thickness and ratio of length to width are 891.
不同树干高度处的平均木材密度、纤维长度和纤维宽度存在显著差异。
The significant differences also existed in wood basic density, fiber length and fiber diameter at different tree height.
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