但直到15世纪，铅带也助力了设计的创造。
But up to the 15th century, the lead strips also helped create the design.
但主要的扩张发生在8世纪。
尽管这些都是世卫组织外部的原因，但本组织仍有必要解决这一问题。
Though the causes are external to WHO, the Organization needs to address this problem.
但这在四世纪就开始改变了。
但这在17世纪初还是一个新概念，所以无论如何，这是连续的，对么？
But it was a new idea in the 1600s. So anyway, that's continuous, right?
但其实在19世纪时，这是很好的写作风格。
But it actually was pretty good writing style in the nineteenth century.
老虎曾经有过一共8个亚种，但其中三个亚种在20世纪灭绝。
There were once eight tiger subspecies, but three became extinct during the 20th century.
彭尼在20世纪80年代也作过类似的部分研究，但研究的目标比较狭隘。
Penny had been part of a similar, but more narrowly focused, study in the 1980s.
但自从20世纪80年代以来，尼日尔的绿化越来越好。
But since the nineteen eighties Niger has gotten a lot greener.
但这一切都是到19世纪才发生。
That's not really until the nineteenth century that that happens.
路德维格二世计划建造许多城堡，但只有其中的2座完工。
Ludwig 2. planned to build many other castles, of which 2 were finished.
但如我刚才所说，马太的结尾很普世。
英雄是一时的，但传奇是一世的。
拿19世纪来举例。唉，但这曾经风光不在。
Take the 19th century for example, but this, alas, is no longer true.
但20世纪60年代，德国工业黄金时代已开始有所减弱。
But by the 1960s, Germany's industrial golden age had begun to wane.
2010年世界杯，但一直没有什么大的破坏。
2010年世界杯，但一直没有什么大的破坏。
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