useful
例子
The first aid kit is packed with supplies, making it incredibly useful in emergencies.
急救箱装满了用品，使其在紧急情况下非常有用。
Online tutorials can be a useful resource for individuals seeking to acquire new skills.
在线教程可以成为寻求获得新技能的个人有用的资源。
词汇树
usefully
usefulness
useful
use
