大家好！怎么用美语说放松休息？kick back 放松How long have we been studying? When was the last time we actually left this library to go outside?咱们学习多久了？咱们上一次离开图书馆到外面去是什么时候？I can't remember. 7 or 8 hours? I need to go home.我不记得了。七八个小时以前？我得回家了。