It's a simple term that encapsulates the fact that relationships at work can reasonably be non-intimate, inconsequential, unimportant and even, dare I say it, disposable or substitutable.
2019年6月六级真题(第三套)阅读 Section C
柯林斯高阶英汉双解学习词典释义
ADJ
用后即可丢弃的;一次性的
A disposable product is designed to be thrown away after it has been used.