bone up英 [bəʊn ʌp]美 [boʊn ʌp]网络 突击钻研; 用功读书; 强化学习英英释义verbstudy intensively, as before an examI had to bone up on my Latin verbs before the final examSynonym:cramgrind awaydrumswotget upmug upswot upbone双语例句
