求翻译：surgical operators were carefully chosen and most had to have demonstrated adequate CEA procedural volume and low complication rates.是什么意思？

待解决

悬赏分：1 - 离问题结束还有

surgical operators were carefully chosen and most had to have demonstrated adequate CEA procedural volume and low complication rates.

问题补充：

匿名	2013-05-23 12:21:38 手术运营商都是经过仔细挑选，最有表现出足够的CEA程序体积和低并发症发生率。

匿名	2013-05-23 12:23:18 外科运营者是经过小心挑选,最有61.64%,表现出了适当程序数量和低并发症率。

匿名	2013-05-23 12:24:58 外科操作员仔细地被选择了和必须最展示了充分CEA程序容量和低复杂化率。

匿名	2013-05-23 12:26:38 外科运算符是慎重选择，多数人表明了充足的癌胚抗原检测程序数量和低并发症率。

匿名	2013-05-23 12:28:18 正在翻译，请等待...

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