求翻译：　　（4）教练员对峙练习前、练习中和练习后“三检”制。练习队每月组织一次互检，黉舍每季度组织一次抽检。是什么意思？

　　(4) the coaches after confrontation exercises, exercises and exercises before "inspection". Mutual checking of organization practice teams once a month, every quarter to organize a school care sampling.