The pertinacious sales rep called the client every week until she finally signed the contract.

那位頑強的業務代表每週都打電話給客戶，直到她終於簽下合約。

Our pertinacious negotiator refused to accept the supplier's first offer on shipping rates.

我們不屈不撓的談判代表拒絕接受供應商提出的第一個運費報價。

The hiring manager admired the candidate's pertinacious efforts to secure an interview despite repeated rejections.

招募經理很欣賞那位應徵者屢遭拒絕仍頑強爭取面試機會的努力。