If you regard someone or something as expendable, you think it is acceptable to get rid of them, abandon them, or allow them to be destroyed when they are no longer needed.
例句
Once our services cease to be useful to them, we're expendable...一旦我们的服务对他们不再有用，我们就可能被抛弃。During the recession, training budgets were seen as an expendable luxury.在经济衰退期间，培训预算被认为是一项可以节省下来的奢侈费用。