keep back是什么意思中文翻译
keep back留存，保留（…的一部分）；隐瞒；保密；
keepv.(使)保持，处于；继续，重复(做某事)；使耽搁；使延误；
backadv.向后；在后；在背面
Police had to erect barriers to keep crowds back.
警察得设立路障来阻截人群。
Why do they keep passing back to the goalie?
他们为什么总是把球回传给守门员？
Neither of them is telling the whole truth. Invariably, they keep something back.