slip by [slip bai]

以下由轻松背单词网站提供

飞掠而过，（时间）悄悄过去

Never let a chance to improve your English slip by！决不要让提高英语水平的机会溜掉了。
Compete with time.Do not let it slip by vacantly.必须与时日竞争。切莫使时日空过。