rough edges idiom
瑕疵，美中不足之处
If something such as a product, a piece of work or a performance has rough edges, some parts of it could be improved.
He's a great player, but his game still has a few rough edges. 他是一个优秀的足球运动员，但他的技艺仍有瑕疵。
（某人的）小缺点，小毛病;偶尔的无礼（或不良行为）
If a person has rough edges, they do not always behave well and politely.
Age and experience have softened his rough edges (= have made him a more polite or gentle person). 岁月和经历改变了他的一些小毛病。