Most other so call ed database abstraction layers for PHP only provide a common API for all supported databas es and only very limited abstr action (mostly only for sequen ces).是什么意思_Most other so call ed database abstraction layers for PHP only provide a common API for all supported databas es and only very limited abstr action (mostly only for sequen ces).在線翻譯_英語_讀音_用法_例句