我觉得有人乱动了打印机的设置。

I think someone has been ___messing ___around ___with the printer settings.

他忍不住要摆弄汽车发动机，尽管它运转良好。

He can't stop ___messing ___around ___with the car engine, even though it works fine.

请不要乱动项目时间表；它已经优化好了。

Please don't ___mess ___around ___with the project timeline; it's already optimized.