Translation of "Racking" in Chinese

He's racking his brains about how to deal with the matter.

他绞尽脑汁想办法搞定这件事。

When one of my coworkers starts racking up good sales figures I can't let down my guard.

若同期的人先一步完成銷售目標，我也不能再吊兒郎當了。