The band has been bubbling under for years, but they haven't had a hit song yet.

这个乐队多年来一直蓄势待发，但还没有一首热门歌曲。

Her new book is bubbling under, and many critics expect it to be a bestseller soon.

她的新书正在蓄势待发，许多评论家预计它很快就会成为畅销书。