To get past those waterproofed hair shafts, shampoos contain two-faced chemical compounds called surfactants.

要穿透这些防水的发根，洗发水中含有一种叫做表面活性剂的双面化学化合物。

STEP 7 Dye your hair for an entirely different look. Since hair color fattens the hair shaft, it will get thicker and bouncier as well.

染发，打造完全不同的发型。由于染发剂会让头发看上去更粗，整体效果更加厚密丰盈。

The pigment is actually produced along the hair shaft, and there are two main forms of hair pigment.

色素实际上是沿着发干产生的，头发色素主要有两种形式。

But because sebum is so good at waterproofing the hair shafts, a phrase I never thought I'd say, a mere shower or bath won't do much in the way of actually cleansing the scalp.

但由于皮脂非常擅长使发干防水，这是我从未想过会说的一句话，单纯的淋浴或洗澡并不能真正清洁头皮。

The part of the hair under the skin is known as the hair root. The hair sticking out from the skin is known as the hair shaft.

皮肤下的毛发部分称为毛根。 从皮肤伸出的毛发称为毛干。