求翻译：门槛从明代出现以后，作为进出的必经之处，对人们有着重大的意义，特别是在封建的古代，门槛被认为是身份的象征，讲究颇多。随着时代的发展，门槛有了新的涵义，门槛不再仅仅指门下的横木，更多的是指从事某项事情的所必须达到的最低标准。是什么意思？

And out must pass through at the threshold from the Ming Dynasty, as people of great significance, especially in feudal ancient times, the threshold is considered a status symbol, pay attention a lot. With the development of the times, the threshold has a new meaning, the threshold is no longer