区别就是两者形相似但意思是不一样，具体的不同如下
repeatly中文意思是反复地
Secreted protein can be harvested from cells culture medium directly and repeatly.
repeatedly中文意思是adv. 重复地，再三地
She claimed she was repeatedly passed over for promotion while less experienced white male colleagues were made partners.
repeat是动词"重复"，它的副词是:repeatedly，没有repeatly这个形式。
