Parenting tips obtained from hunter-gatherers in Africa may be the key to bringing up more contented children, researchers have suggested.
研究人员表示,从非洲狩猎采集者那里获得的育儿技巧可能是培养更满足的孩子的关键。
"researchers have suggested" 是典型的引述插入语,由逗号与主句分隔。它在句中作为说话人态度或信息来源的标注,打断了主句的完整性。完整主句是 "Parenting tips obtained from hunter-gatherers in Africa may be the key to bringing up more contented children (that) researchers have suggested",其中插入语标示了整个陈述的来源。这种引述插入(类似 I think, he said 等)是插入语的常见形式。