You have a long-term relationship with the client.

你与客户有长期的合作关系。

youdao

I have two friends, one black one white, in a long term relationship.

我有两个朋友是长期的男女朋友关系，一个黑人另一个白人。

youdao

What are some mistakes you make in your marriage or long-term relationship?

你的婚姻，或者长期的恋爱中有哪些误会呢？

youdao

His success in radio led to a long-term relationship with Paramount Pictures, a major film company.

VOA: special.2009.03.09

Obviously, what predicts a long-term relationship are probably things less superficial than looks, or at least other things in addition to looks.

很显然，，能预测长期恋情的因素,可能没有长相因素那么肤浅，起码除了长相，还有其他因素。

耶鲁公开课 - 心理学导论课程节选

As a result, people invest in banks -the stock of banks -because they understand that these people have a long-term relationship with business and they are immune from the adverse selection.

结果呢,人们就会投资于银行,即购买银行的股票,因为他们知道,银行家和企业界保持着长期的关系,他们可以免受逆向选择之害

耶鲁公开课 - 金融市场课程节选

Kirven and Antonio have had a long-term relationship with COCA, teaching young dancers at least once a year.

CNN: Alvin Ailey principal dancers retire to give back

The draft agreement on their long-term relationship was signed in Kabul after months of talks.

BBC: US Congressman Dana Rohrabacher denied Afghan entry

But he has something more valuable than cash: a long-term relationship with the architect.

FORBES: Build Your Own Bilbao