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。
So much has changed in the sport since I was a teenager.
自我十几岁以来，该项运动发生了很大变化。
Rock'n'roll has become so commercialized and safe since punk.
摇滚乐自朋克摇滚出现以后已经变得非常商业化和安全了。
I ought not to tell you but I will, since you're in the family, so to speak.
我不该告诉你，但我会告诉你，因为说来你也是这个家庭的一员。
Since it's raining so hard, let's go and see the new exhibits.
既然雨下得这么大，我们去看新开的展览吧。
Since then, so many other examples have been discovered that it no longer makes sense to say that evolution is as good as irreversible.
从那以后，人们又发现了许多其他的例子；因此，“进化几乎是不可逆的”这一说法就不再有意义了。
Since nanorobots are so tiny, they will have to work in large teams of many thousands to 'many millions.
由于纳米机器人如此微小，它们将不得不在由数千到数百万人组成的大型团队中工作。
Since not everybody is so considerate, do what you can do to stay healthy.
鉴于不是每个人都这么体贴，你要做任何可以让自己保持健康的事情。
Since it was to end so soon, I almost wish I had never heard it.
既然它这么快就结束了，我倒是希望我从来没有听见。
I just assume since they're used in so many Italian dishes.
我只是假设，因为那么多意大利菜都用到它们。
I've been feeling ill since last week, so I am sorry that I can't go to your party.
我从上周开始就感觉不适，所以很抱歉我不能参加你的聚会。
This is especially so, since there are such vast differences between the various places in that part of your country.
这方面尤其如此，因为贵国那个地区的不同地方差别很大。
Like, maybe there is no real context, like no definite surroundings, expecially compared to the woman herself, since she is so clear and well-defined.
比方说，可能没有一个真正的背景，比如没有明确的环境，特别是和这个女人自身相比，因为她是如此的清晰和明确。
He has eaten so many eggs since his childhood that he is fed up with them now.
他从小吃鸡蛋吃伤了。
The lady so addressed was the housekeeper, who had lived with Clara since Mrs. Sesemann's death.
被问话的女士是管家，自从赛赛曼太太死后，她就一直和克拉拉住在一起。
Since that is not so, I suppose I must do it.
既然不是这样，我想我必须这样做。
This is all the more so since these discussions almost inevitably turn to questions of prices, patents, intellectual property protection, and competition.
由于这些讨论几乎不可避免地涉及到价格、专利、知识产权保护和竞争等问题，这就更加突出了。
It's been a while since I've seen her so it'll be nice to meet her in town on Thursday.
我很长时间没见她了，所以星期四在镇里见到她将会很高兴。
I've been so alone since you went away.
你走了以后我一直很寂寞。
But I was so nervous since it was my second trial.
但我很紧张，因为这是我的第二次试验。
His success was beyond belief since his competitor was so experienced.
他的成功令人难以置信，因为他的对手非常有经验。
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