Snag is slightly informal. In written English, people usually prefer to use problem or disadvantage instead: 略爲不正式。在書面英語中,人們一般更喜歡說 problem 或 disadvantage
The only disadvantage is that it takes a little longer.
唯一的不足之處是時間長了一點。
2.a part of a dead tree that sticks out, especially one that is under water and can be dangerous 〔死樹伸出水面的〕殘樁;〔尤指水下死樹的〕暗樁
3.a sharp part of something that sticks out and holds or cuts things that touch it 尖突部分