是什么机制控制了用右手或左手的习惯并使左撇子很少出现？
What mechanisms control handedness and keep left-handedness rare?
每年约有2 000位习惯使用左手的人士因不当地使用仅为使用右手的人士设计的设备而死亡。
Around 2, 000 left-handed people die annually due to improper use of equipment designed only for right handed people.
不同文化导致不同的上网习惯，在欧美，网民身体前倾，右手执鼠，左手敲键，很忙活，而中国的网民则身体靠在椅背上，右手移动鼠标，另一只手闲着。
In the U.S. and Europe, web surfers are leaning forward, one hand on the mouse and the other on the keyboard, typing and mousing equally. In China, however, the process is much different.
如果是在一个习惯左手系的星球上，那样我们的习惯会完全相反，就是这样了。
If we had been on the planet with left-handed coordinate systems then actually our conventions would be all the other way around, but they are this way.
习惯呢左手牵右手。
如果您习惯用左手，可以交换鼠标左右键功能。方法是双击“控制面板”中的“鼠标”图标。
You can switch mouse buttons if you are left-handed. Just double-click the mouse icon in Control Panel.
调查显示，83%习惯用右手的母亲把婴儿抱在左侧，然而78%习惯用左手的母亲也这样做。
It emerges that 83 percent of right-handed mothers hold the baby on the left side, but then so do 78 percent of left-handed mothers.
因为我习惯用右手，所以我尽量不用左手工作。
Because I'm right-handed I want to install a minimal amount with my left hand.
而且我当时还没有养成左手吃饭写字的习惯呢，只是在学的时候改的。
At that time, and I have not yet developed the habit of writing his left hand to eat it, but when school reform.
欧洲人的习惯则是左手拿叉子按住肉块，右手拿刀子把肉切开后，继续拿着刀子，左手拿叉子叉住食物送进口中。
European habits are left with a fork hold meat, right hand knife cut the meat, continue holding a knife and left hand with a fork live food sent in imports.
这款色彩鲜艳的训练套装正符合这些特殊的需求，不管是宝宝习惯右手使用还是习惯左手使用。
This colorful starter set is designed to meet all of these special needs for either left-handed or right-handed babies.
如果您习惯用左手，可以交换鼠标左右键功能。
风俗习惯：1不要用你的左手握手！
这位论证者声称，最近的一项调查表明，习惯用左手的人比习惯用右手的人更有可能在企业里取得成功。
This arguer claims that a recent study suggests that left-handed people are more likely to succeed in business than right-handed people.
我们一起在地铁里，我注意到他少了一个拇指，他会习惯性地把左手握成一个拳头。
We were riding on the subway when I noticed that he had a missing thumb. He always balled his left hand up into a fist.
右手习惯的触到左手的戒指。
右手习惯的触到左手的戒指。
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