但有一个问题:和水星凌日不同的是,金星凌日是罕见的,大约每隔一百年会成对出现八年的时间。
But there was a problem: transits of Venus, unlike those of Mercury, are rare, occurring in pairs roughly eight years apart every hundred or so years.
减毒活疫苗被认为是最有效的,但有一个问题:一旦这些病毒苏醒,会发生什么?
The live-attenuated vaccine is considered the most effective, but there is a worry: what might happen once these viruses wake up?
但有一个问题威胁着我们幸福的婚姻生活。
There is, however, one issue that threatens the blissful fabric of our marriage.
But this is a -- this raises a problem, that we'll see actually in just a moment having this duplication.
但这就引起了一个问题,我们刚才看到了,我们有一个重复的值。
If it were just a little bit different I could say, all right, I have a different approximation. But when it's this different, something is wrong. Right?
但是如果仅仅有点差异的话,我可以认为没什么大问题,我得到了一个不太一样的估算,但这确实有差异,出问题了对不对?
The trouble is,imagine the case where we've got one guy who's got all of Napoleon's personality in Michigan, one guy who's got all of Napoleon's personality in New York.
但问题是,试想有这么一个人,出现在密西根,拥有拿破仑完整人格,另一个在纽约,也拥有拿破仑的完整人格。
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