(单词翻译:单击)
听力文本
If you've ever wondered about the shape of your nose, you might be able to blame it on where your ancestors lived.
如果你对自己鼻子的形状感到纳闷，你可能会怪你的祖先生活在哪里。
Specifically, the climate they lived in.
具体来说，他们居住的气候。
Researchers from Pennsylvania State University used 3-D facial imaging to to map a variety of nose measurements, including the length of the ridge, the height of the nose and the width of the nostrils.
宾夕法尼亚州立大学的研究人员使用三维面部成像来绘制各种鼻子数据，包括鼻脊的长度、鼻子的高度和鼻孔的宽度。
They think that last one,nostril width,correlates with the temperature and absolute humidity of the climate your ancestors lived in.
他们认为最后一个，鼻孔的宽度，与你祖先居住气候的温度和绝对湿度有关。
Besides giving us our sense of smell, the nose also heats up and cleans the air we breathe.
鼻子除了给我们嗅觉，也加热和清洁我们呼吸的空气。
Narrower nostrils warm air more efficiently than wider ones. That's essential because the researchers found people with narrower nostrils on average had ancestors who lived in cold, dry climates.
窄鼻孔比宽鼻孔更能有效的温暖空气。这是至关重要的，因为研究人员发现平均鼻孔较窄的人生活在寒冷干燥的气候中。
The study points out where your ancestors lived probably isn't the only reason your nose is shaped how it is.
这项研究指出，你祖先生活在哪里可能并不是你鼻子形状的唯一原因。
They found men tend to have larger noses than women because, duh, dudes are generally larger people than ladies are.
他们发现，男性往往比女性有更大的鼻子，因为，嗯，男性一般体积就比女性大。
And sexual selection probably had a bit to do with it, too. After all, if everyone in your family has narrow nostrils, the chances of you having wider ones are pretty slim.
并且与性选择可能有点关系。毕竟，如果你家里的每个人都是窄鼻狭，那么你拥有更宽鼻孔的可能性就很小了。
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词汇解析
1、essential
绝对必要的;必不可少的;基本的
It was absolutely essential to separate crops from the areas that animals used as pasture.
将庄稼和放牧区分开绝对必要。
As they must also sprint over short distances, speed is essential.
由于他们也必须进行短跑，因此速度至关重要。
基本的;本质的；根本的
Most authorities agree that play is an essential part of a child's development.
大多数权威人士都同意，玩耍在孩子成长过程中起着非常重要的作用。
In this trial two essential elements must be proven: motive and opportunity.
在这次审讯中，必须证明两个基本因素：动机和时机。
（某学科的）基础，基本知识
the essentials of everyday life, such as eating and exercise.
饮食、锻炼等日常生活的要素
This has stripped the contest down to its essentials.
这就使比赛精简到最基本的环节。
2、average
平均数；均值
Take the average of those ratios and multiply by a hundred.
算出那些比率的平均值再乘以100
一般的;通常的;普通的
The average adult man burns 1,500 to 2,000 calories per day.
普通成年男子每天消耗的热量为1,500到2,000卡路里。
Packaging is about a third of what is found in an average British dustbin.
英国垃圾桶里平均约有1/3是产品包装。
正常数量;一般水平
Most areas suffered more rain than usual, with Northern Ireland getting double the average for the month.
大部分地区降雨超过通常水平，北爱尔兰地区本月的降水量则为平均值的两倍。
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