bone up (on sth) ：钻研；突击学习

e.g. I have to bone up on the state driving laws because I have to take my driving test tomorrow.

我得抓紧学习一下州里有关驾驶的法规，因为明天我要去考驾驶执照。

e.g. I take mine next month, so I'll have to bone up, too.

我下个月考，所以我也得临阵磨磨枪。