tinkering

He’s outside tinkering around with his bike.

他在外面捣鼓他自行车。

She spent the afernoon tinkering about in the garden shed.

她在花棚屋里修修补补了一个下午。

They haven’t made any real changes to the system — they’ve just been tinkering around a bit.

他们对系统没有做出何真正改进—只不过是一点修修补补。