英语新闻听写 科学家发现左撇子的真正原因（在线收听）

About 10% of the population is left-handed.

大约10%的人口是左撇子。

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。

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。

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。

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。

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。