“良好的合作伙伴”可以翻译为 "a good/excellent/reliable business partner" 或 "a strong/valued partner in cooperation"，具体可根据语境调整：
1、 通用商务场景：
A good business partner（常用、简洁）
An excellent/reliable partner（强调质量或可靠性）
2、 强调合作深度：
A strong partner in cooperation（突出合作紧密性）
A valued partner（强调重要性或认可度）
3、 正式合同或协议中：
A cooperative partner with a good track record（带经验背景的正式表达）
示例："We are proud to have XYZ Company as a reliable business partner."
"Our collaboration with ABC Corp proves they are a strong partner in cooperation."
根据语境选择最贴切的表述即可。