* 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。