He was rejected by the army because he was under age. 他因尚未成年而被拒絕參軍。
You shouldn’t sell cigarettes to teenagers who are under age. 妳不應該把香煙賣給沒未成年的青少年。
■under arrest 被捕
You are under arrest in the name of the law. 妳被依法逮捕了。
He was soon put [placed] under arrest. 他不久就被逮捕了。
■under attack遭受攻擊
The company has come under fierce attack for its decision to close the factory. 因為決定要關閉工廠，公司受到猛烈攻擊。
■under consideration 在考慮中；在研究中
The question is now under consideration. 這個問題正在考慮中。
The plan is under consideration by the Ministry of Education. 教育部正在研究這個方案。
■under construction 在建造中
The new railway is under construction. 新鐵路正在修建當中。
The bridge is under construction. 這座橋正在建造中。
There are two new hotels near here under construction. 附近正在興建兩家新的旅館。
■under control 在控制中
They soon got the fire under control. 他們很快把火勢控制住。
It took the teacher months to bring his class under control. 這個老師花了幾個月的時間才管住了他的班級。
■under copyright 享有版權
The poem is still under copyright, so you have to pay to quote it. 該詩仍然享有版權，因此妳必須支付引用費。
■under cover 在隱蔽處；秘密地；在信封或郵包中
Plans for the attack were made under cover. 進攻計劃是秘密制定的。
The check came under cover in yesterday’s mail. 支票是裝在信封裏和昨天的信壹道寄來的。
■under discussion 在討論中；在審議中
That has no relation to the matter under discussion. 那與正在討論的事無關。
That’s another topic that will come under discussion. 那是另壹個要討論的問題。
■under examination 在檢查中；在審查中
The prisoner was still under examination. 囚犯仍受審。
The proposals are still under examination. 提案仍在審查中。
■under fire 在炮火中；被攻擊中
We were under fire from all sides. 我們遭到了來自四面八方的射擊。
The headmaster was under fire for not sending the boys home who stole the car. 校長由於沒有開除那幾個偷汽車的學生，受到責難。
■under guarantee 在保修期內
It’s still under guarantee, so the manufacturer will repair it. 保證書還有效，所以廠家會給修理的。
The car is still under guarantee, so you should be able to get it repaired free of charge. 汽車還在保修期內，所以妳應該可以免費修理。
■under oath 在法庭上宣過誓要說實話
The judge reminded the witness that he was still under oath. 那法官提醒證人他已宣誓不作偽證。
■under obligation 有義務；壹定要
The one who did the damage in under obligation to pay for it. 造成損失的人有義務賠償。
註在現代英語中通常用under an [no] obligation的形式：
You’re under no obligation to pay for goods which you did not order. 沒有訂購的貨物就無須付款。
She’s under an obligation to him because he lent her money. 因為他把錢錯給她了，所以她有償還他的義務。
■under obseration （尤指病人或嫌疑犯）在觀察中；在監視中
The doctor put him under observation. 醫生讓他接受觀察。
The police have had him under observation for several weeks. 警方已監視他數周了。
■under pressure 在壓力下；被迫
He always works best under pressure. 他總是在有壓力時工作做得最好。
He only agreed to leave the country under pressure. 他是在壓力下才同意出國的。
■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. 他將步行進城，因為他的自行車在修理。
■under review 在審查中；在復查中
The policy is now under review. 這項政策正在審議之中。
Our contracts are currently under review. 我們的合同正在復查。
■under suspicion 受懷疑，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. 他被懷疑是殺人兇手之壹。
Any man having witnessed the attack is under suspicion. 任何目擊此次襲擊的人都有嫌疑。
■under treatment 在治療中
He is under treatment for malaria. 他正在治療瘧疾。
He is still under treatment in hospital. 他仍在醫院治療。
■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. 大雨之後，這個城鎮的大部分地區都被水淹了。
■under way 在進行中；（船）在航行中
The great ship got under way. 大船啟航了。
Preparations are under way for a wedding. 婚禮的準備工作正在進行當中。
He gave his consent for the project to get under way. 他同意將這個計劃付諸實施。
■under weight 過輕(重)
She is under weight. 她體重太重。
註該短語的反義短語是over weight（過輕）。如：
She is over weight. 她體重太輕。
■under wraps 保密，隱藏
The project has been kept under wraps for years. 這個項目保密了許多年。
The documents will stay under wraps for ten more years. 這些文件要再保密10年。