I was proficient at my job.

我对工很精通。

He proved to me that he was very proficient in driving a car.

他向我证明他开车技术非常熟练。

Weapon-wise, the monk will be proficient with kama, quarterstaff and shuriken.

武器精通，武僧将擅长单镰，棍，和十字剑。

A proficient surgeon is the product of lengthy training and experience.

技术纯熟外科医生是长期训练和实践经验产物。

She is proficient at swimming.

她精通游泳。