Now, another word he used was joyous - meaning full of happiness.

他用的另一个词是开心--意思是充满幸福。

And his heart is full of happiness.

而他的内心充满了幸福。

So, " cheer" means sort of happiness, full of happiness.

所以，“欢呼”意味着某种快乐，充满快乐。