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In theory, shaving ought to be simple: the razor cuts the hair.
理論上說，刮胡子應(yīng)該很簡(jiǎn)單：剃須刀切斷胡須。
In practice, it's not just a matter of razors and hair, there's also shaving cream to consider—foamy stuff that you smear around your hairs before shaving.
實(shí)際上，這并不只關(guān)系到剃刀和胡須，也要考慮能產(chǎn)生泡沫的剃須膏，在刮胡子之前把它涂抹在胡須周圍。
How come? Is shaving cream really necessary and, if so, how does it work?
為甚么？剃須膏真的有必要嗎？如果有，它是如何作用的？
While there's a wide variety of shaving foams available, some with perfumes or other chemicals for your skin,
盡管市面上有琳瑯滿目的剃須膏可供選擇，一些帶有香水，一些帶有護(hù)理肌膚的其它化學(xué)成分，
there's one thing that they all have in common: They're all wet, and this wetness is the key to their function.
但是這些剃須膏有一個(gè)相同點(diǎn)——濕潤，這正是它們發(fā)揮功效的關(guān)鍵。
Wet hair is much easier for a razor to cut than dry hair is, because water makes the proteins in your hair soften and expand.
刮濕潤的胡須通常要比刮干燥的胡須容易，因?yàn)闈穸仁购殐?nèi)的蛋白質(zhì)軟化擴(kuò)張。
While it's possible to shave with a completely dry razor, you probably don't want to try it--it's both painful and inefficient.
雖然也可以用干燥的剃須刀刮胡子，但你可能不會(huì)去試，因?yàn)檫@樣既疼痛又效率不高。
The best way to use shaving cream is to apply it, then wait a couple minutes before shaving.
使用剃須膏最好的方式就是將其敷在胡須上，等兩分鐘再刮。
This is because, while wet hair is good for shaving, completely saturated hair is even better.
這是因?yàn)槌魸駶櫟暮毢苋菀祝敲闯魸裢傅暮殑t更容易了。
It takes about two minutes for the hairs to soak all the way through.
只需兩分鐘，水分就可以完全浸透胡須。
This is a good reason to use shaving cream, instead of just wetting your face with water. The foaminess of the cream helps hold the water in place long enough to soak in.
剃須膏產(chǎn)生的泡沫會(huì)長(zhǎng)時(shí)鎖住水分，使其浸透胡須。這就是為甚么要用剃須膏，而不是直接用水打濕胡須的原因。
For an electric razor, of course, you shouldn't use shaving cream. Electric razors shear your hairs off, snipping them like tiny scissors.
當(dāng)然用電動(dòng)剃須刀剃須的話，就不應(yīng)該再用剃須膏了。電動(dòng)剃須刀像小剪刀似的將胡須剪掉切碎。
This works best on brittle hair that's pointing straight out, which is why electric shaving lotions contain alcohol to dry the hairs and make them stand straight.
它適用于脆性易斷，直立向外生長(zhǎng)的胡須，這就是為什么電動(dòng)剃須香液里含有酒精——酒精使胡須干燥，并直立起來。
可可原創(chuàng)，未經(jīng)許可請(qǐng)勿轉(zhuǎn)載
