1.mobile gaming 手机游戏

例句:This increase in mobile device usage has also led to the growth of the mobile gaming industry.
移动设备的普及也促进了手机游戏产业的发展。

2.back-office 后勤部门

例句:As a result, many back-office jobs, for example, have been relocated to mainland China.
例如，很多后台职位因此转移到了中国内地。

3.catch up with 赶上；追上

例句:The law caught up with him yesterday.
昨天，他被捉拿归案。

4.give away 放弃；赠送

例句:He was arrested for having given away state secrets.
他因泄漏国家机密而被捕。