Human hair wigs are the best because they can be styled in different ways.
人发假发是最好的，因为他们可以以不同的方式设计。
But epidemiological studies, which find statistical associations between sets of data human hair wigs, do not prove cause and effect.
可是流行病学的研究发现，几组资料在数据方面有所关联，却没有证实其因果关系。
Wigs were usually made from human hair, sheep's wool or vegetable fibers.
假发通常是从人的头发，羊的羊毛或植物纤维。
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