闭关政策

zài qīng cháo shí xíng bì guān zhèng cè shí qī zhōng wài mào yì réng gāo sù fā zhǎn

在清朝实行闭关政策时期，中外贸易仍高速发展。

During the time when the closed-door policy was adopted by Qing Dynasty, trade with foreign countries still developed rapidly.