1.at least 至少

例句:He's been away for at least a week.

他走了总有一个星期吧。

2.speed up 加速

例句:He pushed a lever that speeded up the car.

他挂挡加快了速度。

3.work out 解决；算出

例句:Things just didn't work out as planned.

事情根本没有按计划进行。

4.push back 向后推；使撤退

例句:Whatever is pushing on you, you've got to push back.

不管什么攻击你，你都要反击。