英文成語sink one's teeth into 是甚麼意思?就是全心投入。 She would get a job she can sink her teeth into. 她會得到一份她可以全心投入的工作。 ... <看更多>

I was only given small jobs here and there-nothing I could sink my teeth into.分派给我的都是些小活，无法施展身手。 美国之音中文网视频- ... ... <看更多>

library(stringr) string <- c("123-321-中文.jpg", "001-123你好.png") str_extract(string, "[:alpha:]+"). output: [1] "中文" "你好". ... <看更多>