kept trained

kept a specially trained dog中 trained是动词还是形容词 train什么意思?trained呢 crew kept KEPT CUTTING kept是什么意思 turnover of the trained personnel 怎么翻译? should animals be trained to help people? The football team-----trained on the playgroud Should Animals Be Trained to Help Humans The sportsman was trained ------a long jumper. should animals be trained yo help humans