have a rough idea of; have some experience (in); have a smattering of; know(only) a little ❍ 荪甫各方面的布置，我～； ……(茅盾《子夜》 277) I happen to know a thing or two about Sunfu's tactics. ❍ 这选事，小弟自己也～，……(《儒林外史》335) I have had some experience in editing myself，…
略知一二
have a smattering of;know just a little;have a rough idea
略知一二lüè zhī yī èr
稍微知道一点。know sth. about, know only a little, have a rough idea, understand a little about it