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...
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 Police had to erect barriers to keep crowds...
around prep.在...周围 例句 There was no one else around. 周围没有其他人。 The children danced around her. 孩子们在她周围蹦蹦跳跳。 We rowed arou...
