Oil workers have been targeted in the region before.
较早之前这个地区的石油工人便成为目标。
But now we find that this brain region can actually learn to recognize when you might make a mistake, even before a difficult decision has to be made.
但是现在我们发现，事实上，当人们有可能犯错的时候，甚至是在人们作艰难的决定之前，大脑的这一区域就在学着认知这些因素。
Before I set out to travel, I like to find at least four families per region.
在我们准备旅行之前，每个地区有四个家庭就最好不过了。
Before a WHO region can be certified polio-free, three conditions must be satisfied.
世卫组织区域要获得无脊髓灰质炎认证，必须满足三个条件。
We assume that you haven't been to the Changjiang Delta region before.
我们估计你以前没有来过长江三角洲地区。
We assume that you haven't been to the Changjiang Delta region before.
我们估计你以前没有来过长江三角洲地区。
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