以下解答仅供网友参考

【1】He is under suspicion of murder. =He is a murder suspect.

【2】He is under suspicion=He is  a suspect

【备注(1):under suspicion=a suspect】

【备注(2):under suspicion of +名词(sth)=a +名词(sth)+suspect】

【备注(3):suspect: n.嫌疑犯；嫌疑分子；可疑对象】

【备注(4):suspicion: n.怀疑；嫌疑;疑心;疑忌;猜疑】

关于更多under +抽象名词表示被动含义短语如下供网友参考

【1】under suspicion 受怀疑，受猜疑，涉嫌

He was arrested under suspicion. 他受嫌疑而被捕。

He is under suspicion as one of the murderers. 他被怀疑是杀人凶手之一。

Any man having witnessed the attack is under suspicion. 任何目击此次袭击的人都有嫌疑。

【2】under pressure 在压力下；被迫

He always works best under pressure. 他总是在有压力时工作做得最好。

He only agreed to leave the country under pressure. 他是在压力下才同意出国的。

【3】under repair 在修理中

The road is under repair. 道路正在整修。

He will go to town on foot, for his bike is under repair. 他将步行进城，因为他的自行车在修理。

【4】under review 在审查中；在复查中

The policy is now under review. 这项政策正在审议之中。

Our contracts are currently under review. 我们的合同正在复查。

【5】under treatment 在治疗中

He is under treatment for malaria. 他正在治疗疟疾。

He is still under treatment in hospital. 他仍在医院治疗。

【6】under water 在水下；被水淹

Man cannot breathe under water. 人不能在水下呼吸。

After all the rain, most of the town was under water. 大雨之后，这个城镇的大部分地区都被水淹了。

【7】under way 在进行中；（船）在航行中

The great ship got under way. 大船启航了。

Preparations are under way for a wedding. 婚礼的准备工作正在进行当中。

He gave his consent for the project to get under way. 他同意将这个计划付诸实施。

【8】under weight 过轻(重)

She is under weight. 她体重太重。

【备注】该短语的反义短语是over weight（过轻）。

She is over weight. 她体重太轻。

【9】under wraps 保密，隐藏

The project has been kept under wraps for years. 这个项目保密了许多年。

The documents will stay under wraps for ten more years. 这些文件要再保密10年。

【10】under age 未成年，未达到规定年龄

He was rejected by the army because he was under age. 他因尚未成年而被拒绝参军。

You shouldn’t sell cigarettes to teenagers who are under age. 你不应该把香烟卖给没未成年的青少年。

【11】under arrest 被捕

You are under arrest in the name of the law. 你被依法逮捕了。

He was soon put [placed] under arrest. 他不久就被逮捕了。

【12】under attack遭受攻击

The company has come under fierce attack for its decision to close the factory. 因为决定要关闭工厂，公司受到猛烈攻击。

【13】under consideration 在考虑中；在研究中

The question is now under consideration. 这个问题正在考虑中。

The plan is under consideration by the Ministry of Education. 教育部正在研究这个方案。

【14】under construction 在建造中

The new railway is under construction. 新铁路正在修建当中。

The bridge is under construction. 这座桥正在建造中。

There are two new hotels near here under construction. 附近正在兴建两家新的旅馆。

【15】under control 在控制中

They soon got the fire under control. 他们很快把火势控制住。

It took the teacher months to bring his class under control. 这个老师花了几个月的时间才管住了他的班级。

【16】under copyright 享有版权

The poem is still under copyright, so you have to pay to quote it. 该诗仍然享有版权，因此你必须支付引用费。

【17】under cover 在隐蔽处；秘密地；在信封或邮包中

Plans for the attack were made under cover. 进攻计划是秘密制定的。

The check came under cover in yesterday’s mail. 支票是装在信封里和昨天的信一道寄来的。

【18】under discussion 在讨论中；在审议中

That has no relation to the matter under discussion. 那与正在讨论的事无关。

That’s another topic that will come under discussion. 那是另一个要讨论的问题。

【19】under examination 在检查中；在审查中

The prisoner was still under examination. 囚犯仍受审。

The proposals are still under examination. 提案仍在审查中。

【20】under fire 在炮火中；被攻击中

We were under fire from all sides. 我们遭到了来自四面八方的射击。

The headmaster was under fire for not sending the boys home who stole the car. 校长由于没有开除那几个偷汽车的学生，受到责难。

【21】under guarantee 在保修期内

It’s still under guarantee, so the manufacturer will repair it. 保证书还有效，所以厂家会给修理的。

The car is still under guarantee, so you should be able to get it repaired free of charge. 汽车还在保修期内，所以你应该可以免费修理。

【22】under oath 在法庭上宣过誓要说实话

The judge reminded the witness that he was still under oath. 那法官提醒证人他已宣誓不作伪证。

【23】under obligation 有义务；一定要

The one who did the damage in under obligation to pay for it. 造成损失的人有义务赔偿。

【24】under obseration （尤指病人或嫌疑犯）在观察中；在监视中

The doctor put him under observation. 医生让他接受观察。

The police have had him under observation for several weeks. 警方已监视他数周了。