在竞技体育实践中,越来越广泛的推广使用练习器已不能视之为孤立的现象。在整个专业训练方面以及在掌握许多军事技能上,其使用规模已在其采用总量中占有相当大的比重。可是,如果我们在学习和改进动作的许多试验中还会犯错误,那末在许多专业训练中,最初完成的那个不正确的试验,很可能便是最终的结果。正因为这样,需要在那些错误代价较高的地方,解决更多地合 In the practice of competitive sports, more and more widely used trainers can not be regarded as isolated phenomenon. The scale of its use has accounted for a significant share of total adoption in the entire professional training and in the mastery of many military skills. However, if we make mistakes in many experiments in learning and improving action, the incorrect experiment that was first completed in many specialized exercises is likely to be the end result. Because of this, we need to solve more problems at places that are more expensive and costly