By Mark Lobel, BBC News

媒體英語會帶大家一起學習BBC撰稿人在報道世界大事時常用到的單詞和短語。

Background: 近日，美國的科學家們表示他們發現了導致男士們脫發的原因并希望能早日找到治療方法。研究表明人體內有缺陷的毛囊干細胞導致生長出來的毛發細得肉眼無法看得到。

For some men, bald is beautiful.

The iconic look may work for a few - especially celebrities - like the rugged Die Hard star Bruce Willis and Star Trek's Patrick Stewart.

For many though hair loss is no laughing matter. But now researchers in America say they've uncovered a cure.

An academic medical centre has found that hair follicles actually shrink, but don't disappear.

Dr George Cotsarelis, dermatology professor at Pennsylvania University, found the discovery hair-raising.

“What we found surprised us. The stem cells were present but they were not doing their job.”

The discovery of invisible hair sounds too good to be true. But what does it mean?

“It really gives us hope that because the stem cells are present it lowers the bar for developing treatments that could activate the stem cells and get them to form a new hair follicle,” said Dr Cotsarelis.

Treating these faulty stem cells means that, rather than just maintaining hair, we could soon regenerate hair.