听力文本

About 10% of the population is left-handed.
大约10%的人口是左撇子Osl5;|u=w;V4m。
There have been several theories over the years about why some people favour their left hand.
为什么有些人喜欢用左手，关于这个问题，多年来已经有不少理论eHs*j[Or+.Y[,P_^1IO!。
A study from last year has shown that it might be nothing to do with your brain.
去年的一项研究表明，这可能与大脑无关ybZ5]jV.a])n2O。

Rather, it could be determined by your spinal cord while you are in the womb.
相反，这可能在出生前就由脊髓决定了Jx.x6PiI_Ee]IjYIs。
Research which was led by scientists from the Netherlands and South Africa found that gene activity in the spinal cord is already asymmetrical in the womb, and this could be what causes left or right-handedness.
荷兰和南非的科学家们研究发现，脊髓中的基因活动在子宫中已经不对称，这可能是导致左或右利的原因1Iv*4I[O*mYkg_U。
While the baby is growing in the womb, up until about 15 weeks, the motor cortex and the spinal cord are not yet connected, but right or left-handedness is already decided.
胎儿在子宫里生长的时候，直到大约15周，运动皮质和脊髓才相互连接，但是这时喜欢用哪只手已成定局;ye,S-XB#.]_P,。

译文属可可英语原创，未经允许，不得转载+lK=vrgHgo*T8Y。

词语解释

1. left-handed 喜欢用左手的
例句：Everyone knows whether they are left-handed or right-handed, but most people have no idea which side of their brain they favor.
每个人都知道自己擅长左手或右手，但大多数人不知道自己擅长用大脑的哪一边进行思考34D%hBafmoVF8Z-sbl。

2. asymmetrical 不对称的
例句：In conclusion, our dataset is asymmetrical and contains considerable degree of right skew, due to the presence of outliers in the dataset.
在结论之中，我们的数据集是非对称的，并且包含了相当程度的右偏，因为在数据集中有异常值的存在C6ZSkzW;V2。