翻译英语”清朝曾经有过几次可以了解世界的渠道和机会，可惜的是当时的皇帝们都错过了“

There have been a number of the Qing Dynasty can understand the world of channels and opportunities, it is a pity that at the time of the emperor were missed

there were several chances that qing dynasty could learn about the world,but unluckily the emperors at that time missed.

There were some channels and chances that qing dynasty could learn about the world , but that was a pity that the emperors at that time missed

The qing dynasty had several can understand the world's channels and opportunity, unfortunately when emperors were missing