正是这一洞见使得冰岛从1900年前后欧洲最贫穷的国家之一转变为2000年前后最富裕的国家之一。

This insight is what led Iceland to go from being one of the poorest countries in Europe circa 1900 to being one of the richest circa 2000.

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但其面积(体积)、地层厚度、各标志层的长度在变形前后保持相等，即变形前后的剖面是平衡的。

But the area, bed thickness and marker bed length remain unchanged; that is to say, the geological section keeps balanced before and after deformation.

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结果：在胃经沿线脂肪条带结构上三个位点针刺前后痛阈变化明显，在脂肪条带结构旁两个对照位点上针刺前后痛阈未见有意义改变。

Results: the pain threshold before and after acupuncture on points of fat strip structure along the stomach meridian varies obviously, and not the result of the points aside the fat strip structure.

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Long before Milton had begun to tackle the problem, Christians had for centuries, for millennia, puzzled over the logical inconsistency between these two concepts.

早在弥尔顿应对这个问题之前，基督教徒们就已经花了成百上千年，为这两个概念之间逻辑上的前后矛盾感到困惑。

耶鲁公开课 - 弥尔顿课程节选

In between those two parts I will ask that anyone who is shopping the class and would like to leave at that time do so then.

在前后两部分之间,请来试听并且想离开的同学在那时候离开,如果你能尽量等到那个时候。

耶鲁公开课 - 1945年后的美国小说课程节选

So you can imagine a bead with a wire going through it and the bead can only slide back and forth.

你可以想象一个穿在绳子上的珠子,小珠只能前后滑动

耶鲁公开课 - 基础物理课程节选