at/on sight

1. 一见(就)

They had orders to shoot on sight.

他们接到命令说见人就开枪。

at first sight

1. 初见; 初看之下

They fell in love as soon as they met: it was love at first sight.

他们一见面就坠入情网, 真是一见钟情。

at (the) sight of

1. 一看见

At the sight of the police officers they ran off.

一看见那些警官, 他们便逃跑了。

catch sight of

1. 看到

I caught sight of her hurrying away but I didn't try to speak to her.

我看见她匆忙走开, 但我并没有跟她讲话。

in sight

1. 看得见

No car is in sight.

一辆汽车也看不见。

lose sight of

1. 不再看见

I've lost sight of that bird.

我看不到那只鸟了。

out of sight

1. 在看不见的地方

The train was soon out of sight.

那火车很快就看不见了。

2. 好极了; 太棒了; 十全十美

That birthday gift was really out of sight.

那件生日礼物实在是太棒了。

His new sports car is really out of sight.

他的新跑车实在太棒了。

set one's sights on

1. 力求

We have set our sights on a bigger house.

我们一心想买幢大一点的房子。