智课网IELTS备考资料剑桥雅思报考指南(MP3+字幕)第53期:OG22Recording50(下)_雅思听力Humansloseupto100strandsofhairaday,butwedohavequitealotofhairtostartwith.人类每天最多会掉100根头发，但我们本来发量就很多。There'ssomevariationdependingonhaircolourbutforanaverageadultthestrandcountis100,000,solosing100adayisnottoobad.根据发色不同，发量也有所不同，对于普通成年人而言，发量为10万根，所以一天掉100根也没什么。Althoughthisistheaverage,peoplewithredhairhavearound80,000strands,blackorbrownhair100,000andblondeshaveabout120,000.尽管这是一般情况，红头发者发量约在8万根，黑发或棕发者在10万根，金发者约有12万根头发。SohairusedtobeimportantforthereasonsImentionedearlier,butnowadaysI'dsaythemainimportanceofhairisthefactthatitisbigbusiness.毛发一度起重要作用，此前我也已提及原因，但现在来说，头发的重要性主要体现在其（衍生的）大型产业。Apartfromthemoneyinvolvedinhaircutting,shaving,trimming,etc.,afortuneisspentjustonhairproducts.除去剪发、剃须和修剪等等的费用以外，人们在美发产品上也投入了一大笔钱。IntheUKalone,consumersspendoverfivebillionpoundseachyearonthese.仅仅在英国，消费者每年花费超过50亿英镑购买美发产品。Sonext,I'dliketojustgiveyouaquickoverviewofthestructureofhair.接下来，我想给你们大概讲讲头发的结构。Asyoucansee,alongthelengthofthehair,therearethreemainpartscalledthebulb,therootandtheshaft.正如你们所见，顺着头发长度不同，主要分三个部分，分别是毛囊、毛根和毛干。Asinglehairisfixedatoneendbelowtheskininthebulb.Thebulbactsratherlikeacap-itenclosestheendofthehairinthehead.每根头发都由皮肤以下的毛囊固定住其中一端，毛囊的作用有些像一个箍，将头发紧附于头皮。Thenextpartofthehairistherootandthisisthepartofthehairwhichliesjustbeneaththeskinand,intermsofhairproduction,isthemostimportant.下一部分为毛根（发根），这部分就在表皮以下，对于生发来说，起最关键作用。Thiscanbeconsideredthecontrolcentreforeachstrandofhairandiswheretheglandsarefound.我们可将这部分当作每根头发的控制中心，腺体也在此分布。Theseproduceoilwhichflowsalongthelengthofthehairandthehealthoftherootdeterminestheoverallhealthofthestrandofhair.这些腺体分泌油脂，顺着头发流动，发根健康程度决定该根毛发的总体健康。Thelastpartistheshaftandthisisthehairwhichisabovetheskinandis,ofcourse,whatwecansee.最后就一部分是毛干，这是皮上的毛发，也就是我们能看见的毛发。Fortunately,thisisnotactive,andIsay"fortunately"becauseotherwiseitwouldbeverypainfultohaveyourhaircut!幸运的是，这部分极不活跃。我说“幸运”，是因为若毛干很活跃，要理发就会变得非常痛苦。AndfinallyI'djustliketogooverafewfactorsthatimpactontheoverallhealthofhair.最后我想讲讲影响头发整体健康的几个因素。Likeeveryotherpartofthebody,ourdiet(thatiswhatweeat)isextremelyimportanttotheconditionofourhair.就和身体的其它部位一样，我们的饮食（即我们吃的是什么）对于头发的状态说至关重要。Butwhereasachangeinyourdietto,forexample,eatingunhealthyfoodswillsoonbenoticeableinyourskin,changestoyourhairwilltakealotlonger.但尽管饮食的改变会明显反映于皮肤（例如吃不健康的食品），对头发的影响则需要经过较长时间才能体现。Achangeindiettodaycouldtakeseveralmonthstohaveaneffectonyourhair.现在，饮食的变化要经过数月时间才会影响头发状态。Andsowhatisthekeytohealthyhair?Well,eatingabalanceddietisthemostimportantthing.那头发健康的关键是什么呢？饮食均衡是最重要的。Thereareanumberofvitaminsthatarevitalforgoodhairhealth,themainonesbeingvitaminsC,DandE,andinabalanceddietallthesevitaminsshouldbereadilyavailable.有好几种维生素对于健康头发都是必不可少的，主要是维生素C，D和E，均衡的饮食中应同时包含这些维生素。IfyouneedaboostofvitaminC,forexample,oneofthebestthingstoeatareblueberries.例如，如果你需要大量补充维生素C，最好吃点蓝莓。ForvitaminD,thebestexamplesarefish,mushroomsandeggsandforvitaminE,nutsandseeds.Right,let'sgoonto...要摄入维生素D，最好吃点鱼、蘑菇和鸡蛋，维生素E则是坚果和种子。好了，接下来…
