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 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。
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。
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。
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？
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。
It sounds sensible, in theory.
理论上看，这听起来明智多了。
专家说在理论上是的。
This, however, is only in theory.
然而，这只是理论上的。
EVERYONE is green now, at least in theory.
现在似乎人人都环保，至少理论上是这样。
理论上，确实如此。
This is much harder in practice than in theory.
这一条在实践中比在理论上难得多。
Career managers run the company for you — in theory.
职业经理替你经营这个公司——理论上是这样。
But then, in theory American house prices never fall.
但当时美国的房价在理论上是不可能下跌的。
Computing: Quantum cryptography is unbreakable in theory.
计算：量子密码理论上是无法破解的。
The medical students are well trained both in theory and practice.
这些医学生在理论和实践方面都是训练有素的。
That sounds almost reasonable in theory, but what, in practice, does it mean?
这听起来在理论上还算合理，可是如何操作呢？
That sounds almost reasonable in theory, but what, in practice, does it mean?
这听起来在理论上还算合理，可是如何操作呢？
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