at first sight

乍一看，一见之下；立即

At first sight the difficulty looks greater than it really is.

乍看起来困难较大，但实际上并非如此。

at（或on，upon）sight

一见（就）

The guard had orders to shoot on sight.

哨兵奉命见对象就开枪。

catch sight of

看到，发现；意识到

catch sight of oneself in the mirror

在镜中看到自己

in（或within）sight

看得见，被见到

No vehicle is in sight.

车子一辆也看不见。

in sight of

在看得到……的地方；到看得见……的程度

We came in sight of the shore at midday.

中午时分，我们见到了海岸。

lose sight of

不再看见

We lost sight of the boat in the fog.

雾中，我们再也看不到那条小船。

总结一组近义词吧~

Look; gaze; glance; glare; ogle; peep; scan; stare

look

看；注视

Look at this painting!

看这幅画！

gaze

（长时间）凝视，注视（具有吸引力的人或物）

We gazed at the majesty of the mountains.

我们凝望着雄伟的山脉。

glance

扫视；瞥见；匆匆一看

I glanced back over my shoulder to make sure that no one was following me.

我朝背后瞥了一眼，以确信没有人在跟踪我。

glare

怒目而视

John glared at me when I mentioned his wife.

我提到他妻子时，约翰愤怒地瞪着我。

ogle

送秋波，抛媚眼；色迷迷地看

She is fed up with being ogled by strange men.

她极其厌烦被陌生男人色迷迷地盯着看。

peep

快速地看；瞥见

She peeped at him through her fringe.

她透过额发瞥了他一眼。

scan

浏览；扫视；审视（有时可与glance互换使用）

She was anxiously scanning the newspaper to see if her name was mentioned.

她急切地浏览着报纸，看自己的名字有没有被提到。

stare

（长时间地，有时指无礼地）盯着看，注视

He could not help staring at her.

他忍不住盯着她看。

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