Since only one female usually lays eggs in a given larva, it would pay her to produce one male only, because this one male could fertilize all his sisters on emergence.
因为通常只有一只雌性在一个特定的幼虫中产卵，所以它只会产生一只雄性，因为这只雄性可以在孵化时使它所有的姐妹受精。
In short, for each Arabic numeral, there is one, and only one, Roman numeral which maps to it.
简而言之，每个阿拉伯数字对应一个罗马数字，而且只有一个罗马数字映射到它。
Make only enough to fill one large tumbler—or else you'll be packing away too many calories in one sitting.
做只够装一大平底玻璃杯的份量——否则你一次就餐会摄入太多的卡路里。
Only at the time when one's breathing, mind and posture get into one, one is in the condition of yoga exercise.
只有当呼吸、意识和姿势结合成一体时，才是真正的瑜伽练习。
One is randomly chosen to propose how a sum of money, known to both, should be shared between them; only one offer, which must be accepted or rejected without negotiation, is allowed.
其中一人被随机挑选出来，提出双方都知道的一笔钱应该如何分配；只允许有一个报价，必须被接受或拒绝，没有谈判。
While SIP is a request-response protocol, there is not necessarily only one response to every one request.
虽然SIP是请求-响应协议，但每个请求不一定只有一个响应与之对应。
Seriously, I only have one pair of shoes because I only have one pair of feet.
说真的，我只有一双鞋，因为我只有一双脚。
Stonehenge, a rock circle, is not only one of Britain's most famous historical places but also one of its greatest mysteries.
巨石阵是一个巨石圈，它不仅是英国最著名的历史遗迹，也是英国最大的谜团之一。
If you leave, for example, a bar of ice supported only at one end, the end, the unsupported end will deform under its own weight, it'll kind of flatten out at one end, get distorted, deformed.
举个例子，如果你把一根只有一端支撑的冰放在一边，没有支撑的一端会在自身的重量下变形，它的一端会变平，变形。
You mustn't think that there is only one teacher there, and such a kind one as we have here.
你不要以为那儿只有一个老师，像我们这里这样的一位好老师。
Because one vertex can only have one normal, you must duplicate the vertices as well.
由于一个顶点只能有一条法线，所以你还要复制顶点。
Since we only take one step at a time, there is no need to plan our route for one can make continuous decisions about where to turn next.
既然我们一次只走一步，就没有必要计划我们的路线，因为一个人可以不断地决定下一步去哪里。
What if your life had only one bin, one ball to juggle, one plate to spin？
如果你生活中只有一个任务箱，只需抛一个球，只需转一个盘子呢？
In this game, you only have one starting point, one destination, and one competitor.
在这个游戏中，你只有一个起点、一个终点和一位竞争对手。
The largest terrestrial planet, Earth has a diameter only one quarter as great as the diameter of the smallest Jovian planet, Neptune, and its mass is only one seventeenth as great.
最大的类地行星地球的直径仅仅是最小的类木行星海王星的四分之一，而且地球的质量仅仅是其质量的十七分之一。
It suggests the children remember the researcher they've met just one time when they were only one-year-olds.
这表明，孩子们还记得他们只有一岁时仅见过一面的研究人员。
One adult could only book one child ticket.
一个成人只能订一张儿童票。
One day Vicky brought only one letter to Mrs. Smith.
有一天，维姬只给史密斯太太带来了一封信。
One country can only enter one team in tug of war.
一个国家只能有一支队伍参加拔河比赛。
One female panda usually has only one baby, and it is not easy for wild pandas to have twins anyway.
一只雌性熊猫通常只有一个孩子，而且野生熊猫要生双胞胎也不容易。
We need only one, but the first one became damaged before I could finish it, so I' m working on a new one.
我们只需要一个，但是第一个在我完成之前就损坏了，所以我正在做一个新的。
Yet, the only one who cares about any mistake is the one who is speaking.
然而，唯一在意失误的人就是在讲话的人。
This one stranger responded beautifully to my small crisis, but she actually wasn't the only one.
这个陌生人漂亮地处理了我的危机，但实际上，她并不是唯一一个（这样做的）。
Because you have only one life and only one chance to do all the things you want to do.
因为你的生命只有一次，也仅有一次机会去做你所有想做的事。
If a category always drills to one and only one category then the two levels should be merged.
如果一个分类总是属于一个且只属于一个分类，那么这两个层次就应该合并。
But this class needs to implement one — and only one — interface.
但是，此类需要实现一个接口，而且只实现一个接口。
This is a fairly simple example, and many of the participants provide only one service that has only one capability.
这是一个十分简单的例子，其中有多个参与者只会提供一种服务，并且只有一种功能。
This is a fairly simple example, and many of the service providers provide only one service that has only one capability.
这是一个相当简单的例子，许多服务提供者仅仅提供一项只具有一种功能的服务。
Evidently one, and only one, tiny leaf beetle can dance on this pin's head — the silvery circle in this 40 X photo.
显然一个，并且只有一个，小小的叶甲才能在这个大头针顶——这张40倍图片上银色的圆周——上跳舞。
Evidently one, and only one, tiny leaf beetle can dance on this pin's head — the silvery circle in this 40 X photo.
显然一个，并且只有一个，小小的叶甲才能在这个大头针顶——这张40倍图片上银色的圆周——上跳舞。
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