1.depth的基本意思是“深度”,指某物从上到下的距离或从表面到内部的距离,引申可指感情的深厚,印象的深刻、深切。
2.其复数形式是depths,表示“底部”“深处”,还可用于比喻说法,表示“深处”“最强烈部分”“中间部分”,其前需有定冠词the。

beyond one's depth
超过某人的理解力 unable to understand a subject or topic
It's beyond my depth when it comes to natural sciences.谈到自然科学我就茫然。
He decided that his brother's geometry book was beyond his depth.他确认他无法理解他哥哥的几何书。

in depth
深入地,全面地 thoroughly
This is a new subject and needs to be explored in depth.这是个新课题,需要深入研究。

in the depth(s) of
在…的深处 when or where sth is deepest, most severe, etc.
〔说明〕 in the depth of中的depth除了和winter、night或country等固定搭配用作单数外,其他一般用作复数。
Most old overseas Chinese keep in the depths of their souls a longing for their motherland.多数老华侨深深怀念祖国。
In the depths of a drought I have watched the fight over a water hole.在干旱严重的时候,我看到过为了争喝一口水而互相斗起来。
If you are in the depths of despair, you are extremely unhappy.如果你彻底地失望,你会十分不开心。
He is sunk in the depths of vice.他堕入罪恶的深渊。
Strange creatures live in the profound depths of the ocean.大洋的深处生活着稀奇古怪的生物。

out of one's depth
1.在水深没顶的地方 in the water too deep to stand in
If you can't swim, don't go out of your depth.如果你不会游泳就别到水深没顶的地方去。
2.超出了某人知识和理解力的范围 unable to understand a subject or topic
If you get him talking on art, he is soon out of his depth.如果你和他谈论艺术,他很快就不知该如何作答了。
3.束手无策 unable to do sth
Peter managed quite well in chemistry at school, but when he went to the university he soon got out of his depth.上中学时彼得的化学学得相当好,可是上大学之后很快就学不进去了。

to the depth(s) of
深到… the deep of
Gold also seems to stir men to the depth of their being.淘金对人们的吸引力似乎很大。
The ragged path leads all the way to the depths of the woods.那条崎岖不平的羊肠小道一直通往林子的深处。

What is the depth of this lake?这个湖有多深?
We dived to a depth of 30 feet.我们潜到水下30英尺处。
The depth of the hall is 150 feet.大厅的纵深为150英尺。
In searching for oil some wells have been drilled to a depth of more than 20,000 feet. 为了寻找石油,有的油井已钻到20,000英尺以上的深度。
Snow accumulated to a depth of 5 feet.雪堆积达五英尺高。
Water could be drawn from great depths by placing several pumps in series.把几台抽水机连起来,便可把水从地下很深的地方抽出来。
The old man disappeared into the depths of the house.老人消失在住宅深处。
There are heavy concentrations of that fish at the lower depths.那种鱼大量聚集在深潭。

［同义词］   deepness, profoundity, profoundness
［反义词］   height, loftiness, shallowness, tallness
［词源］  ＜中古英语depute (深)