When his cows calve each year he keeps one or two calves for his family.
每年他的母牛产犊时，他都为家里留下一两头。
For (the sake of) convenience , the two groups have been treated as one in this report.
为方便起见，这两个组在本报告中被视为一组。
Given the extraordinary diversity of life on the planet, there must be mechanisms for speciation: the formation of two species from one original species.
考虑到地球上的生命的非凡多样性，一定存在着形成物种的机制：从一个原始物种演变为两个物种。
For a brief moment during that stage of its life cycle, the tongue consists of two tiny half-tubes before merging into one.
在它生命周期的这一阶段，有短暂的一刻，其舌头由两个微小的半管组成，随后融合为一体。
One January, I had to officiate at two funerals on successive days for two elderly women in my community.
在某个1月，我不得不连续两天为我们社区的两名老年妇女主持两场葬礼。
She'd been working in Manchester for two years, and no one—not one of her colleagues—had ever invited her to their home.
她在曼彻斯特工作了两年，而没有人——没有一个同事——邀请过她去他们家。
For a time the two trains ran parallel, now one gaining a little, now the other.
有一段时间，两列火车平行行驶，有时一列火车稍微靠前，有时则是另一列。
Even though one or two degree Celsius rise in sea surface temperature for a relatively short amount of time can cause bleaching.
即使海面温度在短时间内升高一到两摄氏度，也可能会引起褪色。
In usual materials, one finds an inverse relation between the two properties, whereas for many practical applications simultaneous presence of both properties is desirable.
在通常的材料中，人们会发现这两种性质之间的反比关系，而在许多实际应用中，同时存在这两种性质是可取的。
There will be two ballot boxes—one for yesses and one for noes.
将设两个投票箱—一个放赞成票，一个放反对票。
I'll swap these two bottles for that one.
我要拿这两瓶换那一瓶。
Intruders might invade your systems for one of two reasons: to gain access to information that they should not have or to alter the behavior of a system.
入侵者入侵您的系统可能是出于这两个原因之一：为了获取他们本不应该拥有的信息，或者为了改变系统的行为。
They housed eight adult rats with two types of robotic rat—one social and one asocial—for four days.
他们将8只成年老鼠和2种机器老鼠（一种是社会性的，一种是非社会性的）一起饲养了4天。
For those of you who are interested in developing your writing skills, we have a six-week course which runs for two hours between 4 and 6 on Wednesday afternoons beginning in week one.
对于那些有兴趣提高写作技能的人，我们有一个为期六周的课程，从第一周开始，每周三下午4点到6点上课。
I'll tell you one or two of my little adventures, Mole, and you shall judge for yourself!
莫尔，我给你讲一两件我小小的冒险经历，你自己来判断吧！
He has downloaded seven news apps, through which he reads for one or two hours a day.
他下载了七个新闻的应用程序，每天通过这些程序阅读一到两个小时。
People from southern China say that they always buy what they need for just one or two meals.
来自中国南方的人说，他们总是只买一两顿饭所需要的东西。
What's more, if you don't remember the next word or line, pause for one or two seconds to look at your note card.
更重要的是，如果你不记得下一个单词或句子，暂停一两秒钟看看你的笔记卡。
A month before my first marathon, one of my ankles was injured and this meant not running for two weeks, leaving me only two weeks to train.
在我第一次参加马拉松比赛的前一个月，我的一只脚踝受伤了，这意味着两个星期不能跑步，只剩两个星期的训练时间。
A wind farm proposed for one of the two counties should be built in County Y rather than in County X.
在两者进行选择时，应该在Y县而不是 X县建立风电场。
A person needs two mono fins, one for each foot.
一个人需要两个单鳍，每只脚一个。
As I take my gloves off and reach for my phone, I think, "It can't be that tough to make headphones with two plugs, one for music and one for your cell phone.
当我脱下手套并拿起我的手机时，我想，“做一个有两个插头的耳机，一个用于音乐，一个用于手机，不会那么难吧。”
He paid with a two-for-one coupon.
他用一张买二送一优惠券结账。
Her journey home first took her to Chengdu for two days and one night, she rested for a night at a hotel before spending another 14 hours on a train to Yuexi county, Liangshan.
她在回家的路上，先在成都停留了两天一夜，在一家酒店休息了一夜，然后又坐了14个小时的火车去往凉山越西县。
It's unfair to punish a whole class for the actions of one or two students.
因为个别同学的行为而惩罚全班是不公平的。
There are only two rooms in his house—one for his parents and the other for Jack and his little brother, John.
他的家里只有两个房间——一间是他父母的，另一间是杰克和他的弟弟约翰的。
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