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。
In short, for each Arabic numeral, there is one, and only one, Roman numeral which maps to it.
这意味着在CSS中我们的一个类应该有一个原则而且只有一个理由去改变。
The principle implies that A class should have one, and only one, reason to change. In CSS we have.
不管什么原因，当你被搁浅的时候，而且只有一个投资者，唯一的出路就是找到其他的投资者。
Whatever the reason, when you're stranded and you have one investor the only way out is to find new outside investors.
报告说，城市医院的状况非常恶劣，缺乏最基本的药物，而且只有一个或2个外科医生。
It says the city hospital is in terrible condition, lacks the most basic medicines and only has one or two surgeons.
在精神层面上承认上帝的存在，而且只有一个上帝，这个观点反对盲目崇拜和多神论，坚持只有一个上帝的观点。
It's simply the mental acknowledgement of the existence of God and that God is one, that is, the rejection of idolatry and polytheism and the idea that God is one.
我们都知道，斯特拉福镇只有一个产业——威廉·莎士比亚，但这里有两个泾渭分明、而且越来越敌对的群体。
Stratford-on-Avon, as we all know, has only one industry—William Shakespeare—but there are two distinctly separate and increasingly hostile branches.
1962年，瑞典当时只有一个电视频道，而且是以黑白色率播出节目。
In 1962, there was only one TV channel in Sweden, and it broadcast in black and white.
查尔德把它放回平底锅里之后说：“但你总能把它捡起来，而且如果只有你一个人在厨房里，谁又会看到呢？”
Child put it back in the pan, saying, "But you can always pick it up and if you're alone in the kitchen, who's going to see it?"
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。
One female panda usually has only one baby, and it is not easy for wild pandas to have twins anyway.
只有四家公司有一定的规模，而且它们在中国已经经营了一个世纪。
Only four firms have any scale, and they have been in China for a century.
当一个联网环境内托管多个应用程序，而且只有来自特定应用程序的内容需要压缩时，此特性尤其重要。
This feature is important when more than one application is hosted in a networked environment and only content from specific applications need to be compressed.
而且如果说有多个光源的话，为什么每个物体只有一个影子呢？
And if there are multiple light sources, why does each object only cast one shadow?
映射区分大小写，只有当方法拥有一个返回值而且没有输入参数时才能匹配。
The mapping is case insensitive and only matches if the method has a return value and no input parameters.
现在只有一个人能帮她，而且这个人必须自己找出他的答案。
There is only one person who can. And this person has to find his responses alone.
女人到她这样的年纪，父母都变老了，自己的孩子进入了青春期，而且因为现在大多数家庭只有一个孩子，所以给孩子提供一个好的教育的压力很大。
With women my age, their parents are getting old; their children are starting puberty, and since we mostly have only one child, there is so much pressure to provide a good education.
他们之前只有一个扫描仪，而且通常不会让大多数人通过检查。
They only had one scanner before, and they didn't used to make the majority of people go through it.
这些街道上的五金、酒水和食品店基本都只有一个贮藏柜大小，而且照明也跟一个贮藏柜差不多。
The hardware, liquor and food stores down the block were each the size of a storage closet and about as well lighted.
当你从微软买一个操作系统，你不仅不能对它随意调整，而且可能在几年内误以为市场上只有一个操作系统。
When you buy an OS from Microsoft, not only you can't fix it, but it has had years of being skewed by one single entity's sense of the market.
丙想既然这个岛国只有一个岛，而且岛是非生产资产，这个岛一定会升值。
C thought that since there is only one piece of land in the country and land is non productive asset, its value must definitely go up.
我没有地方住，因为夏末之前根本没有想过还会回来，而且只有在第一个学年，学院才会保证我们有房住。
I didn't have a place to stay, because until the end of summer I hadn't thought I was coming back, and we got guaranteed rooms in college only the first year.
而且原来作父母还有“批发价”：只有一个孩子的家庭比有两个孩子的平均多花25%，到你有三个或更多的时候，你每个少花22%。
Turns out parents get a bulk discount: people with only one child spend 25% more per child than families with two, and by the time you have three or more, you are spending 22% less on each one.
1962年，瑞典只有一个电视频道，而且是黑白的。
In 1962, there was only one TV channel in Sweden and it broadcast in black and white.
由于JonGalloway等人，确保了升级过程是一个平稳的过程，而且只有十步之遥。
Thanks to folks like Jon Galloway ensuring the upgrade process is a smooth one and only 10 steps away.
与此相反，标准病理学方法需要至少3天的时间才能完成一个诊断，而且只有84%的准确率，研究人员提到。
In contrast, standard pathology methods typically require three or more days to produce a diagnosis and are only 84 percent accurate, the researchers noted.
StatCVS从命令行运行很容易，因为只有一个JAR文件，而且可以把JAR文件名直接传给虚拟机。
StatCVS is easy to run from the command line because there's only one JAR file, and you can pass that JAR file name directly to the virtual machine.
而且不是随便一个纸袋都行，只有那些印着大牌LOGO的才可以—越高级(或她们看起来越快乐)越好。
And not just any bags, but ones marked with brand logos - the more upscale or upbeat the better.
请注意，format _ tb返回的是一个列表，而且此列表中只有一个异常。
Notice that format_tb returns a list and that there is only one exception in this list.
在本例中，只有一个参数—id—而且它指定了您想要查看其时间表的那个用户的twitter名。
In this case, there is only one parameter-id-and it specifies the Twitter name of the user whose timeline you want to view.
它配备了12寸车轮，没有内胎，挡风玻璃上也只有1个雨刮，而且司机必须要适应一个后视镜，但麻雀虽小五脏俱全。
Wheels, the tires have no inner tubes, the windshield has just a single wiper and drivers must make do with one side mirror. But it's not simply a stripped-down car.
它配备了12寸车轮，没有内胎，挡风玻璃上也只有1个雨刮，而且司机必须要适应一个后视镜，但麻雀虽小五脏俱全。
Wheels, the tires have no inner tubes, the windshield has just a single wiper and drivers must make do with one side mirror. But it's not simply a stripped-down car.
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