adj.必要的，必需的，必然的
n.现金；必需的事物

The new equipment is needful for the smooth operation of our factory.
这新设备是我们工厂顺畅运作所必需的。
We need to purchase some more supplies; they are needful for our project.
我们需要再购买一些物资；它们对我们这个项目是必需的。
Water and food are needful for human survival.
水和食物是人类生存所必需的。
In order to prepare for the upcoming winter, we need to stock up on firewood, which is a needful item.
为了应对即将到来的冬天，我们需要囤积柴火，这是必需品之一。
The software update is a needful step for improving the system's performance.
软件更新是提高系统性能所必需的步骤。
The book is a needful resource for anyone studying this subject.
这本书是任何学习这门学科的人都需要的资源。
In the aftermath of the disaster, the provision of shelter became an immediate needful concern.
灾后，提供避难所成为了迫切需要关注的问题。
It is needful that we all contribute to the community in some way.
我们都应该以某种方式为社区做出贡献，这是必要的。
The healthcare workers are considered needful during the pandemic.
医护人员在疫情期间被认为是必不可少的。
The training program is needful for all employees to enhance their skills.
培训计划对所有员工增强技能都是必要的。