In medieval europe , children from seven on were initiated into adult work .
在欧洲中世纪时期,儿童从七岁起就开始学习成年人的工作了。
More egregiously , say the americans , north korea initiated a covert uranium-enrichment programme .
更让人惊讶的是,美国人认为北朝鲜开始了秘密的铀浓缩计划。
It is important that both attention and behavior , once initiated in a particular direction , tend to persist in that direction for a considerable time interval .