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?
如果灯亮了又灭了好几次，海豚就应该先按左手的杠杆，再按右手的杠杆。
If the light flashed on and off several times, the dolphins were supposed to press the left-hand lever followed by the right-hand one.
在左手的背面，她发现了用旧墨水刺的译车号，现在开始变得模糊和散开。
On the back of the left hand, she made out the post horn tattooed in old ink now beginning to blur and spread.
左手的扬声器看样子失灵了。
新娘把金戒指戴在新郎左手的第三个手指上。
The bride will place a gold wedding ring on the third finger of the groom's left hand.
新郎把金戒指戴在新娘左手的第三个手指上。
The groom will place a gold wedding ring on the third finger of the bride's left hand.
阿拉丁把戒指戴在左手的小指上，沿着台阶走了下去。
Aladdin put the ring on the little finger of his left hand and began to go down the stairs.
我们总是握住了左手的幸福，却遗忘了自己右手的孤独。
We always hold the happiness of the left hand, but forget the loneliness of his right hand.
我的双手都被烧得焦黑，左手的皮肤已经脱离了肌肉，挂在手上。
I was face down outside the plane, my hands were charred and black, and the skin on my left hand was hanging off.
左手的部分通常会需要较强的力量，但却比较缺乏速度与技巧。
The LH tends to get passages that require more strength, but it often lags behind in speed and technique.
把右手的一个指头醮在左手的油里，在耶和华面前用指头弹七次。
Dip his right forefinger into the oil in his palm, and with his finger sprinkle some of it before the Lord seven times.
选举官头也不抬，用塑料棒沾了紫色墨水就在我左手的中指上抹下一条污渍。
The polling officer didn't even raise her head. After dipping a plastic straw into a bottle of purple ink, she drew a blotchy line down the middle finger of my left hand.
这种观点是，右手中微子可能比左手的中微子重得多，因此可以提供必要的重力。
The idea is that right-handed neutrinos might be much heavier than left-handed ones and so could provide the requisite gravity.
希拉里达芙总是上头条可不全因为街拍和左手的大钻戒，她还有颗博爱的心。
Hilary Duff makes headlines these days not by mugging for mugshots like many of her peers, but by being a philanthropic soul.
斯莫列特船长从坐着的地方站了起来，往他左手的掌心上磕了磕烟斗里的灰。
Captain Smollett rose from his seat, and knocked out the ashes of his pipe in the palm of his left hand.
斯莫列特船长从坐着的地方站了起来，往他左手的掌心上磕了磕烟斗里的灰。
Captain Smollett rose from his seat and knocked out the ashes of his pipe in the palm of his left hand.
伸出你的右手，然后用左手的食指和中指按图示方法对右手的各个手指进行拉伸。
Hold your right hand out and, using the index and middle fingers of your left hand, stretch between each as shown.
那么应该不必吃惊在数学家和建筑师中，左手趋势越来越广泛，惯用左手的男性比女性多。
It should be no surprise then that among mathematicians and architects, left-handers tend to be more common and there are more left-handed males than females.
他几乎完全瘫痪，不能说话，离不开轮椅，能够活动的只有他面部的肌肉和他左手的两个指头。
He is almost totally paralyzed, speechless and wheelchair-bound, able to move only his facial muscles and two fingers on his left hand.
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.
订婚和婚礼戒指会戴在左手的第四个手指上，因为古希腊和罗马人认为那个手指的血管直抵心脏。
Engagement and wedding rings are worn on the fourth finger of the left hand, because ancient Greeks and Romans believed that a vein in that finger led directly to the heart.
弦乐器的演奏者练习的则是在左手的手指上下滑动的同时，用右手前后拉动琴弓——两个截然不同的动作。
String players practice moving the fingers of the left hand up and down, while drawing the bow to and fro with the right arm — two entirely different movements.
弦乐器的演奏者练习的则是在左手的手指上下滑动的同时，用右手前后拉动琴弓——两个截然不同的动作。
String players practice moving the fingers of the left hand up and down, while drawing the bow to and fro with the right arm-two entirely different movements.
魔多场景结束之后，为了避免与之前的故事情节产生矛盾，彼得·杰克逊故意减少拍摄弗罗多左手的次数。
Peter Jackson purposely avoided filming Frodo's left hand after the Mordor scenes to avoid conflicts as to the positioning of the wound on the index finger.
但是在他记性最好的年岁里就植根于他脑海中的，反对使用左手的深深的偏见，却并不是轻而易举可以摆脱的。
But the deep prejudice against the use of the left hand which was instilled in him during his most impressionable years will not be so easily done away with.
你还记得一前，我们初次见面的那天，你微微的笑温暖我心，谁知道后来我们关系那么密切，你靠在我左手的肩问为什么月亮这么圆？
Do you remember one before the day we first met, you smile slightly warm my heart, who knows what our relationship was so close, you lean left shoulder and asked me why I am so circle the moon?
你还记得一前，我们初次见面的那天，你微微的笑温暖我心，谁知道后来我们关系那么密切，你靠在我左手的肩问为什么月亮这么圆？
Do you remember one before the day we first met, you smile slightly warm my heart, who knows what our relationship was so close, you lean left shoulder and asked me why I am so circle the moon?
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