可可電臺，每期節(jié)目一話題，讓英語磨練耳朵的同時(shí)學(xué)到更多有益的小知識，豐富知識的同時(shí)受益于生活。

Why do we have fingerprints?

我們?yōu)槭裁从兄讣y？

Many experts think it's to improve grip, but a British study from a few years back suggests otherwise.

有的專家認(rèn)為這會(huì)增加在抓取時(shí)手上的摩擦力，但最近幾年英國的調(diào)查顯示并非如此。

Researchers found that a fingerprint's ridges actually madeit harder to hold flat, smooth surfaces, like Plexiglas, because they reduced the skin’s contact area.

研究者發(fā)現(xiàn)指紋的脊?fàn)罘炊谷藗冸y抓平滑的表面，比如樹脂玻璃，因?yàn)橹讣y減少了皮膚的接觸面積。

Instead, they think our prints might help wick water off our fingertips or allow our skin to stretch more easily, which can protect it from damage and help prevent blisters.

他們反倒認(rèn)為指紋有可能是能防止指尖的水分流失，或使得我們皮膚更易吸收水分，從而保護(hù)皮膚防止起水泡。

Other scientists have suggested fingerprints could improve our sense of touch.

其他科學(xué)家還認(rèn)為指紋能提高我們的觸覺。

What we do know for sure is that no two people's fingerprints are the same, even among identical twins.

目前我們確切知道的是：每個(gè)人的指紋都與其他人的不同，就算是雙胞胎也如此。

【知識點(diǎn)】

fingerprints指紋

plexiglas樹脂玻璃

identical完全相同的