如果左旋氨基酸占大多数的话，就说明这些氨基酸从根源上来说是具有生物性的。
A prevalence of left-handed amino acids would indicate they were biological in origin.
组成地球上蛋白质的那20个（氨基酸）都是左旋氨基酸。
The twenty that make up the proteins on Earth are all left-handed.
在实验中，右旋卵子的细胞质注射改变了左旋卵子的形态，但是左旋卵子的细胞质注射不会影响到右旋卵子。
In experiments, an injection of cytoplasm from dextral eggs changes the pattern of sinisterly eggs, but an injection from sinisterly eggs does not influence dextral eggs.
此外，左旋和右旋蜗牛可能无法交配，因为它们的扭曲方向不相容。
In addition, perhaps left and right-handed snails cannot mate with each other, having incompatible twist directions.
在实验中，用取自右旋卵子的细胞质进行的注射，可改变左旋卵子的模式；用取自左旋卵子的细胞质进行的注射却不能影响到右旋卵子。
In experiments, an injection of cytoplasm from dextral eggs changes the pattern of sinistral eggs, but an injection from sinistral eggs does not influence dextral eggs.
然而，一些卵壳中会出现反向螺旋的蜗牛，多数情况下是在左旋卵壳中，右旋的出生率惊人地高。
However, some broods possess a few snails of the opposing hand, and in predominantly sinistral broods, the incidence of dextrality is surprisingly high.
如果发现了氨基酸，并且它们普遍表现出同一种偏向性——要么像地球上的氨基酸一样是左旋的，要么是右旋的，那将会格外有趣。
If amino acids are found, it would be especially interesting if they show a prevalence of one type of handedness, either left, like amino acids on Earth, or right.
甲基苯丙胺以右旋和左旋两种对映体形式存在。
Methamphetamine exists as two enantiomers, dextrorotary and levorotary.
运用 L-3，4-dihydroxyphenylalanine（左旋多巴）临床治疗帕金森有其局限之处。
Treatment of Parkinson's disease with L-3,4- dihydroxyphenylalanine (L-DOPA) has its limits.
像其他许多分子一样，氟比洛芬酯具有左旋和右旋两种形式。
Like many other molecules, flurbiprofen has a left-handed and a right-handed form.
构成生命体的许多关键分子都有一个特定的导向，或者说是旋向性：脱氧核糖核酸右旋，氨基酸左旋。
Many of the key molecules for life have a specific direction, or handedness: DNA twists to the right, amino acids to the left.
左旋分子就是使偏振光发生左(即逆时针方向)旋的分子。
A left-handed molecule is one that causes polarised light to rotate to the left (ie, anticlockwise).
它不仅携带了右旋和左旋氨基酸，而且还包含几十种生命至始至终从来不会利用的特殊氨基酸。
Not only does it carry both right - and left-handed versions of normal amino acids; it also contains dozens of exotic amino acids that life ended up not using at all.
化学家们在实验室合成有机化合物的时候，常常会得到一堆分子：一半右旋，一半左旋。
When chemists synthesize organic compounds in the lab, they often wind up with a mix of molecules: half are right-handed, and half are left.
在生物化学中，手性是有意义的，如左旋和右旋的物质气味可能不同。
In biochemistry, handedness can matter. Left - and right-handed versions may, for example, smell different.
光滑表面会反射一个反向的优选极化波，而粗糙地区的反射波是左旋极化波。
While smooth surfaces send back a reversed, right-polarized wave, rough areas return left-polarized waves.
在生命诞生之时，我们的祖先就作出了选择：糖右旋，氨基酸左旋，这个规律延续至今。
When life arose, our ancestors made some choices. They went with the right-handed sugars, and the left-handed amino acids, a tradition still in effect.
好吧，先把自己推出办公桌，然而从右向左旋转四到五次，别把眼睛闭上，接着再看屏幕。
Just push yourself back from your desk and spin around four or five times from right to left with your eyes open. Then look back at this screen.
这类特征中最奇异的一个就是许多构成生命的分子是左旋的。
And one of the most bizarre of these features is that a lot of the molecules of which life is made are left-handed.
冰，对电磁波来说则是透明的，会把原来的左旋极化波反射回来。
Ice, which is transparent to radio waves, also sends back left-polarized waves.
要向左旋转，请使用负数。
剑在她的手中左旋右劈，上下翻舞。收剑的时候，她潇洒地做最后一次转身，才缓缓停下来。
She spun and whirled, wove and danced with the sword, and when she finished, she let herself spin one more time before slowly coming a halt.
一直往左旋转旋钮更新就会暂停。
Turn the knob all the way left, and the updates will be paused.
研究者们利用小鼠晶胚来培育脑组织，并且设定了一种环境，在此环境下，脑组织会逐渐流失左旋多巴胺神经细胞，这与帕金逊症的症状非常相似。
Using tissue from mouse embryos, researchers prepared brain cultures using conditions that favor the slowly progressing loss of dopamine neurons, a hallmark of the disease.
那个叫做Mini-SAR的雷达，通过向月表发射左旋极化电磁脉冲来测定月球的表面粗糙度。
The radar, called the Mini-SAR, sends pulses of left-polarized radio waves out to measure the surface roughness of the moon.
这样，最简单的酮糖HOCH 2 -C：O-CH 2 OH即为triulose（丙酮糖）；最常见得酮糖D-果糖（左旋糖）即为hexulose（己酮糖）。
Thus, the simplest ketose, HOCH2-C:O-CH2OH, is a triulose; the most common ketose, D-fructose (levulose), is a hexlose.
如果一个角色的头部从左旋转到右，在一半的点上，它应该向下点一下或向上抬一点，由它是看哪里来决定的。
That is if a characters head rotates from left to right, at the halfway point, it should actually be dipped or raised slighly depends on where it is looking.
几乎无法想象左旋本身会给左旋者带来任何不利之处。 然而，左旋与右旋蜗牛彼此间实际上并不呈真正的镜像对称....。。
But left- and right-handed snails are not actually true mirror images of one another…
经常患者拿着左旋多巴的处方，左旋多巴在脑细胞中在酶的作用可以转变为多巴胺。
Often patients are given prescriptions for levodopa, or L-dopa, which is converted into dopamine by enzymes in the brain.
经常患者拿着左旋多巴的处方，左旋多巴在脑细胞中在酶的作用可以转变为多巴胺。
Often patients are given prescriptions for levodopa, or L-dopa, which is converted into dopamine by enzymes in the brain.
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