In theory I'm on call day and night.
理论上，我不分昼夜随叫随到。
In theory, these machines should last for ten years or more.
从理论上讲，这些机器应能用十年以上。
In theory, the buyer could ask the seller to have a test carried out.
在理论上，买方可以要求卖方进行一次产品检测。
Achieving these goals is relatively easy in theory, yet quite difficult in practice.
实现这些目标从理论上说比较容易，但在实践上却相当困难。
In theory, a girl may veto the spouse her parents have chosen.
理论上，女孩可以不接受她父母已为自己选择的配偶。
In the internet age, at least in theory, this fraction can be much reduced.
在互联网时代，至少在理论上，这个比例可以大大降低。
In theory, at least, the problem is that there are very many choices to make.
至少在理论上，问题在于我们要做太多选择。
In theory, interactive advertising can engage viewers in a way that 30-second spots do not.
理论上，交互式广告能够以一种30秒广告做不到的方式来吸引观众。
Pupils attend the school in their own neighbourhood, which in theory removes ranking by school.
学生们在自己的社区上学，这在理论上解决了学校排名的问题。
In theory, says Valentijn, this can create a high enough temperature to generate superheated steam.
瓦伦坦泰因说，理论上，这可以创造一个足够高的温度来产生过热蒸汽。
"In theory," says Valentine, "this can create a high enough temperature to generate superheated steam."
“理论上，”瓦伦丁说，“这可以产生一个足够高的温度来产生过热的蒸汽。”
We could do this in theory by studying an enormous impact crater, known as the South Pole-Aitken Basin.
理论上，我们可以通过研究一个名为南极-艾特肯盆地的巨大陨石坑来做到这一点。
While consumers are spending less on toilet paper, they remain fussy—in theory at least—when it comes to paper quality.
虽然消费者在卫生纸上的花费减少了，但当涉及纸质时，他们仍然很挑剔，至少从理论上来说是这样。
While consumers are spending less on toilet paper, they remain fussy in theory at least when it comes to paper quality.
虽然消费者在卫生纸上的花费减少了，但从理论来看，他们至少对于纸的质量仍然很挑剔。
The other alternatives are attractive in theory but in practice are either impractical or offer only marginal improvements.
其他替代方案在理论上很有吸引力，但在实践中要么不切实际，要么只能提供微不足道的改进。
In theory, Argentina, Canada, Chile, China, Russia, and the United Kingdom could use wind to meet all of their energy needs.
理论上，阿根廷、加拿大、智利、中国、俄罗斯和英国可以利用风能来满足所有的能源需求。
In theory, you need molten iron in the core to generate one, but Mercury is so small, its core should have long since solidified.
理论上，你需要核心里的熔化铁来产生它，但是水星很小，它的核心凝固还要很久。
Conversely, flat sharing can be very cheap and there will always be someone to talk to and go out with, and the chores, in theory, can be shared.
相反，合租公寓可能很便宜，而且总会有人可以一起聊天，一起出去，并且理论上还可以一起分担家务。
Importing African cheetahs to the western United States could, in theory, put the pronghorn back onto its natural evolutionary trajectory according to these biologists.
从理论上讲，把非洲猎豹引进美国西部，可以让叉角羚重新回到生物学家所说的自然进化轨道上。
On two separate morning visits to the scientists' lab, each man walked for an hour at an average speed that, in theory, should allow his body to rely mainly on fat for fuel.
在科学家的实验室里，每个人分别在上午的两次访问中，以平均速度走了一个小时，理论上，他的身体应该主要依靠脂肪作为燃料。
That sounds fine in theory, but have you really thought it through?
这话听起来很有道理，但是你真正全面考虑过没有？
The second critical decision came in 1979 when it was required that every teacher gain a fifth-year Master's degree in theory and practice, paid for by the state.
第二个重要决定是在1979年做出的，当时要求每位教师都必须获得由国家出资的理论与实践专业五年制硕士学位。
Mexico’s institutions have been transformed in theory, but a better ma?ana will never dawn unless Mexican attitudes change too.
墨西哥的政府机构在理论上是转变了，但只有墨西哥人的态度也发生改变，美好的明天才会来临。
Sort of makes sense, in theory.
理论上，似乎还挺有道理的。
In theory all this is possible.
理论上这一切都是可行的。
专家说在理论上是的。
专家说，理论上是安全的。
This, however, is only in theory.
然而，这只是理论上的。
In theory, China has lots of birds.
在理论上，中国有许多种鸟。
In theory, there is an easy answer.
在理论上有个简单答案。
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