question database maintenance 题库维护
maintenance question
维护的问题
以上为机器翻译结果，长、整句建议使用 人工翻译 。
So the question is, if all these transit providers need to do similar levels of maintenance work, why do some of them run twenty four hours, but not BART?
FORBES: Why Does BART Need To Do Nightly Maintenance?
应用推荐
模块上移
模块下移
不移动