当政

zhè duàn shí qī kuà dù jiào cháng lì jīng jiǔ cháo měi cháo dāng zhèng zhě duì dài hǎi jìn de tài du yě bù jìn xiāng tóng

这段时期跨度较长，历经九朝，每朝当政者对待海禁的态度也不尽相同。

This time span is long and passes through nine dynasties, and each dynasty has different manners for treatment maritime embargo.