While hunter-gatherer children learn from observation and imitation in mixed-age playgroups, researchers said that western "instructive teaching", where pupils are asked to sit still, may contribute to conditions such as attention deficit hyperactivity disorder.
虽然采集狩猎社会的儿童在混龄游戏小组中通过观察和模仿学习，但研究人员表示，西方的"指导式教学"，要求学生保持安静坐定，可能会导致注意力缺陷多动障碍等状况。
This deficit is a testament to the effectiveness of modern firefighting, said Kelly Martin, a past president of the International Association of Wildland Fire.
凯利·马丁表示，国际荒野火灾协会前会长称，这一赤字证明了现代消防的有效性。
例句取自历年考研英语真题，翻译为机器生成，仅供学习参考。