You can use requisite to indicate that something is necessary for a particular purpose.
例句
She filled in the requisite paperwork.她完成了必要的书面工作。
N-COUNT
必需品;必备品;必要条件
A requisite is something which is necessary for a particular purpose.
例句
An understanding of accounting techniques is a major requisite for the work of the analysts.懂得会计知识是从事分析员工作的一个必要条件。...his little bag of hunting requisites.他的一小包狩猎必需品