这些会分泌油脂，油脂顺着头发流动，而发根的健康程度决定了该缕毛发的总体健康。
These produce oil which flows along the length of the hair and the health of the root determines the overall health of the strand of hair.
这节课将涵盖关于头发的好几点知识：毛发的结构以及影响头发整体健康的因素。
This lecture covers a number of facts about hair—its structure and what can affect the general health of hair.
一撮粘住的毛发，下水道被我浓密的头发堵住。
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