One needs the designers, and perhaps the regulators, before the builders and operators, and each group of workers in training has to know there is work waiting beyond graduation.
2015年12月六级真题（第一套）阅读 Section B
柯林斯高阶英汉双解学习词典释义
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建筑工人；建造者
A builder is a person whose job is to build or repair houses and other buildings.