一眼就看出的英文：
with half an eye

参考例句：

A single glance will tell you how hot or cold your tap water is with the chameleon faucet.
只要安上一个“变色龙”牌水龙头，你就能一眼看出自来水的温度。

The doctor saw at a glance that child had measles.
医生一眼就看出孩子得了麻疹。

I spotted him at once as an American.
我一眼就看出他是个美国人。

I saw at a glance that he was exceedingly dexterous in the bushman’s art of handing a stock-whip
我一眼就看出他深谙丛林人的用鞭之道。

The wheelwright had seen at the first glance that the tilbury was a hired vehicle
那位车匠师父一眼就看出他那辆小车是租来的。

The most short-sighted man could see that at a glance, with his naked eye, said Martin
近视得再厉害的人，也能用肉眼一眼看出。马丁说。

half是什么意思：
n. 一半；半场，半局
adj. 一半的，不完全的
adv. 一半地，部分地

That is a job and a half.
那是非常困难的工作。

half-believe ";"half believing, half doubting
将信将疑

His reply was taken half seriously half in jest.
他的答覆看来是半开玩笑半认真的。

a half - and - half mixture of linseed oil and turpentine.
亚麻籽油和松节油两种成分各占一半的混合物

eye是什么意思：
n. 眼睛；视力；眼光；见解，观点
v. 注视，细看

An eye for an eye and a tooth for a tooth
以眼还眼,以牙还牙

It is a mere coincidence that they see eye to eye on this point.
他们在这一点上见解一致完全是巧合。

I think we see eye to eye on that subject.
我认为我们在那个问题上看法一致。

Eye broccoli is the exact opposite of eye candy.
Eye broccoli 和 eye candy（外表悦目的人）意思相反。

Her eyes rolled with curiosity.
她的眼睛因好奇而左右转动。