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月四級真題（第三套）閱讀 Section B
英語六級真題
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月六級真題（第二套）閱讀 Section B
柯林斯高階英漢雙解學習詞典釋義
N-COUNT
訂約人;立約人;承包商
A contractor is a person or company that does work for other people or organizations.