We're talking a bit of science fiction now, but in theory there's nothing that stops you going out (into space).

我们谈论了很多科幻小说罢了，但在理论上没有什么能阻止你要出去（倒太空间）。

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The cost would be high, $60 billion or more, but in theory could be spread across many years and tens of millions of electrical customers.

成本将很高，要投600亿美元或更多，不过，在理论上可能跨越多个年度，涉及到数以千万计的电力用户。

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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。

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The researchers had a theory. They thought that people who were bitten by infected mosquitoes,but recovered, were protected in the future.

VOA: special.2011.05.31

But in theory, in principle, this is what we're wondering about when we face choices.

但在理论上，在原则上，这是我们面对选择时会考虑的情况。

耶鲁公开课 - 死亡课程节选

Now in addition to defining literature, literary theory also asks questions obviously not unrelated but which open up the field somewhat.

除了定义文学以外，文学理论还提出一些,显然不是不相关，却开辟了新领域的问题。

耶鲁公开课 - 文学理论导论课程节选

But in theory shareholders should not care whether dividends are paid out today or later.

ECONOMIST: Stockmarkets and dividends

But in theory the prime minister is no more than first among cabinet equals.

ECONOMIST: The cafeti��re theory of government

But in theory electronic cigarettes can be used anywhere - on planes, trains, in hospitals.

BBC: Electronic cigarettes - miracle or menace?