Let’s start at the root of the issu

让我们从问题的根源开始（双关语 100% 有意）：毛囊。事实证明，我们毛囊的形状是我们头发质地的主要决定因素。如果你看直发的毛囊，你会发现它是完美的圆形。卷发的毛囊呈椭圆形。椭圆形越平坦，头发就越卷曲。<br><br>另一个导致头发卷曲的因素是毛囊进入头皮的方式。直发毛囊从皮肤表面垂直向下进入真皮层。如果毛囊角度进入真皮，那么头发会随着生长而弯曲，从而导致卷曲。虽然，毛囊的这种弯曲会导致华丽的卷发，但它会导致所有卷发的人都可以证明的一个主要缺点，干燥。在真皮内，特殊的腺体排列在毛囊内以分泌称为皮脂的油来润滑头发。不幸的是，当毛囊弯曲时，皮脂不能沿着头发的长度移动，导致头发干燥且得不到润滑。

Let’s start at the root of the issue (pun 100 percent intended): the follicle. It turns out that the shape of our follicles is a major determinant of our hair texture. If you were to look at the follicle of straight hair, you would find it is perfectly round. The follicle of curly hair adopts an oval shape. The flatter the oval is, the curlier the hair will be.Another contributing factor to a hair’s curl is the way the follicle tunnels into the scalp. Follicles of straight hair tunnel vertically down from the skin’s surface into the dermis. If the follicle angles into the dermis then the hair will curve as it grows causing it curl. Although, this curving of the follicle can lead to gorgeous curls it causes one major drawback that all curly-haired persons can attest to, dryness. Within the dermis, special glands line the follicle to secrete oil, called sebum, to lubricate the hair. Unfortunately, when follicles curve sebum isn’t able to travel the length of the hair as well leading to dryness of hair that doesn’t get lubricated.<br>

让我们从问题的根源开始(双关语100%有意):毛囊。事实证明，毛囊的形状是我们头发质地的主要决定因素。如果你观察直发的毛囊，你会发现它非常圆。卷发的毛囊呈椭圆形。椭圆形越平，头发就越卷曲。头发卷曲的另一个促成因素是毛囊进入头皮的方式。直发毛囊从皮肤表面垂直向下进入真皮。如果毛囊与真皮成角度，那么头发会随着生长而弯曲，从而卷曲。尽管毛囊的这种弯曲会导致华丽的卷发，但它会导致一个所有卷发人都能证明的主要缺点，干燥。在真皮中，特殊的腺体排列在毛囊中，分泌称为皮脂的油来润滑头发。不幸的是，当毛囊弯曲时，皮脂不能沿着头发的长度移动，导致头发干燥，得不到润滑。