How high is the real English level of the stars?

When Sun Nan and CoCo Lee co-wrote the Olympic theme song Forever Friends, they were embarrassed by their poor English. CoCo Lee/Kloc-0 immigrated to the United States with his parents at the age of 0/0, and the special growth environment made CoCo Lee very international. Sun Nan's mastery of English songs made it even worse. Sun Nan's English pronunciation has Beijing flavor, but with the help of CoCo Lee and others, his pronunciation has finally become international. Finally finished singing. But it is still questioned by many people that he should not be allowed to sing Olympic songs.