1
useful for sth / doing sth
This tool is useful for cutting metal.
这个工具对切割金属很有用。
有用的；实用的
先理解核心含义，再看它在真实句子里的用法。
有用的；实用的
having a practical or beneficial use; being of service or help
This tool is useful for cutting metal.
这个工具对切割金属很有用。
有实际或有益用途的。
Having a practical or beneficial use.
有用或服务的
being of use or service
具有实用功能的
having a useful function
This app is useful for finding cheap flights.
这个应用程序对查找廉价航班很有用。
AI contextual example
She gave me some useful advice about the interview.
她给了我一些关于面试的有用建议。
AI contextual example
A pocket knife is useful when you go camping.
去露营时，一把小刀很有用。
AI contextual example
the girl felt motherly and useful
这个女孩感到母性和有用
WordNet
This tool is useful for cutting metal.
这个工具对切割金属很有用。
The advice was very useful to me.
这个建议对我很有用。
She is useful in organizing events.
她在组织活动方面很有用。
It is useful to learn basic grammar.
学习基础语法很有用。
Not this
This tool is very use.
Use this
This tool is very useful.
use 是动词，而此处需要形容词来修饰名词 tool；useful 是正确的形容词形式。
Not this
The useful of this app is undeniable.
Use this
The usefulness of this app is undeniable.
useful 是形容词，不能直接作名词；此处需要名词 usefulness 表示‘有用性’。
Focus on the distinctions below. Other candidates are kept compact until a reliable usage note is available.
有用的信息
This website provides a lot of useful information.
有用的工具
A hammer is a useful tool for many jobs.
有用的技能
Learning a second language is a useful skill.
有用的提示
Here is a useful tip for saving money.
有用的建议
My teacher gave me some useful advice.
有用的资源
The library is a useful resource for students.
派上用场
I kept the old keys because they might come in useful one day.
我留着旧钥匙，因为也许有一天它们会派上用场。
帮上忙
While we were waiting, she made herself useful by tidying the room.
在我们等待的时候，她通过整理房间来帮忙。
《银河系漫游指南》是一本非常了不起的书。它肯定是最成功的。而且它绝对是最有用的。
The Guide is described as the most useful book in the universe.
这本书被描述为宇宙中最有用的书。
Use useful naturally, then get feedback on meaning, tone, grammar, and phrasing.
Revisit a common error or keep this word in your review list.
useful = use（使用）+ ful（充满），充满使用价值，即有用的
语域：neutral 常见场景：advice、object、information 通常用于描述事物有帮助或实用价值，中性词，适合各种场合。
常用于‘useful for’和‘useful to’结构，表示对某物或某人有用。
Dictionary facts from DICTIONARY_API_DEV, ECDICT, WIKTIONARY.