This is hard to achieve when, as is now the case in many big firms, a large proportion of staff are temporary contractors.
2017年6月四级真题（第三套）阅读 Section B
英语六级真题
For instance, DeWalt discovered that many contractors were holding on to their old tools, even if they no longer worked, because they were expensive purchases and it was hard to justify bringing them in to recycle.
2019年6月六级真题（第二套）阅读 Section B
柯林斯高阶英汉双解学习词典释义
N-COUNT
订约人;立约人;承包商
A contractor is a person or company that does work for other people or organizations.