Now, even in these categories there's variation, and inside that variation comes more active areas of research where less is known for sure.

如今，即使这些类中有，中有更为活跃却不为人知的究领域。

It's a variation off of an old-school wrap called a fracture wrap, using gauze and pins to really create tension and lay the hair as flat as possible on the head.

这是一包法的体，叫做骨折包法，使用纱布和发夹来提供张力，尽可能地将头发平铺头上。