今日短语 口语表达 “knuckle down” 的意思是 “开始努力做某项任务”，比如 “开始用功学习或辛勤工作”。有人认为该说法源于弹球游戏，这是 ...

The first time I listened to Ani DiFranco's Knuckle Down, I clearly had done it the wrong way. At the end, I wasn't able to tell the difference between the album's twelve tracks -- it was as if ...