核心词议：
adj. 不必要的；多余的，无用的
unnecessary 基本解释
adj. 不必要的，多余的；无用的，无益的；无须
速记方法
速记技巧 词根词缀法 un-否定+ne-否定+-cess-行走，退让→离开+-ary形容词词尾→可以离开的
知识扩展
同根词汇 unnecessarily 不必要地；多余地
重要短语
unnecessary expenses 不必要的开支
中文词源
中文词源： unnecessary
精选例句
1、 It’s more likely that none of us start a conversation because it’s awkward and challenging, or we think it’s annoying and unnecessary.
更有可能的是，我们没有人开始交谈，因为这很尴尬，很有挑战性，或者我们认为这很烦人，没有必要。[机器自动翻译，如有错误，感谢纠错]
2、 I hate unnecessary waste.
我憎恨不必要的浪费。
1、 ''These extra features are deemed unnecessary by the majority of shoppers, which probably reflects how these types of products are typically more expensive than regular toilet paper, even when on special offer.
“大多数购物者认为这些额外的功能是不必要的，这可能反映了这类产品通常比普通卫生纸更贵，即使是在特价时。”
1、 But overall, we suspect that a lot of unnecessary or even dangerous tests and[P] The House bill would authorize the secretary of health and human services to negotiate drug prices in Medicare and Medicaid.
但总的来说，我们怀疑有很多不必要的甚至危险的测试，众议院的法案将授权卫生和公共服务部长就医疗保险和医疗补助计划的药品价格进行谈判。
1、 Further arrangements – and there may be many – between the NHS and DeepMind will be carefully scrutinised to ensure that all necessary permissions have been asked of patients and all unnecessary data has been cleaned.
NHS和DeepMind之间的进一步安排——可能会有很多——将被仔细审查，以确保所有必要的许可都得到了患者的许可，所有不必要的数据都被清理了。
常见考点例句：
- Being afraid of high cholesterol is totally unnecessary .
- 害怕的高胆固醇是完全不必要的。
- Conventional war with china is , and will likely remain , unnecessary and unlikely .
- 与中国的传统战争是，也将是很可能是维持的，不必要的和不太可能的。
- No point in creating totally unnecessary conflicts .
- 没必要制造完全不需要的冲突。
- The company says unions are unnecessary for its employees .
- 公司声称工会对于它的雇员来说是多余的。
- In a floating exchange-rate regime reserve accumulations should also be unnecessary .
- 在浮动汇率机制下，储备的累积也应是多余的。
