it was shown in china quite a while back i still remember the plot clearly
问题描述：
it was shown in china quite a while back i still remember the plot clearly
back 在这里是什么用法和解释
答
那是很久以前在中国展示过的 我仍然记得很清楚那个情景的.
quite a while back 跟 long ago 差不多的意思 我觉得是同义吧
back 当回到以前 追溯到以往这类的 就是往回看