teach sb the ropes是什么意思及用法

teach sb the ropes是什么意思及用法 on the ropes teach sb America's machine-tool industry was on the ropes.on the ropes是垂死挣扎吗?我没查到这个意思 teach sb sth.teach sb to do VELVET ROPES在这里是啥意思?原句是:i will tell you what goes on behind the velvet ropes of the best event dresses Teach sth.to sb. teach sb 怎样 sth? give sb a lesson &teach sb a lesson give sb a lesson &teach sb a lesson 有什么区别.那个是教育,哪个是教训还是什么的, give sb a lesson &teach sb a lesson give sb a lesson &teach sb a lesson 有什么区别.那个是教育,哪个是教训还是什么的, teach的用法teach sb 是加 doing 还是to do sth? teach sth for sb 还是teach sb to sb更正！【teach sth for sb 还是teach sth to sb】？ 给别人指路时可不可以用teach sb the way to...表示给别人指路时可不可以用teach sb the way to somewhere? teach sb do sth 还是teach sb to do sth teach sb.to do和teach sb.doing的区别 teach sb to sth和 teach sb sth的区别 teach sb.to do sth. teach sb a lesson和teach sb sth和teach sb to do 有何区别