deep

• 形容从顶部或表面向下延伸很远，也可指程度深、深刻、深厚或深奥。

Describes something that extends far down from the top or surface, or is profound in nature.

1. A1formal

   Extending far down from the top or surface.

   深的

   • The lake is very deep in the middle.
   • They dug a deep hole for the foundation.
   • The water was deep enough to swim in.

   同义词bottomlesscavernousprofoundunfathomableyawning

   反义词shallow

2. Profound or intenseB1formal

   Very great or intense in degree, especially of a feeling or condition.

   深刻的

   • She felt a deep sense of gratitude.
   • He was in a deep sleep.
   • The movie left a deep impression on me.

   同义词ardentearnestextremeferventgreatintensepassionateprofoundstrong

   反义词shallowsuperficialsurfacetrivial

3. Complex or difficult to understandB2formal

   Difficult to understand or penetrate intellectually.

   深奥

   • The philosopher's ideas are too deep for me.
   • This is a deep and complex subject.
   • Her analysis was surprisingly deep for a student.

   同义词abstruseesotericinscrutableprofoundreconditesubtleunfathomableweighty

   反义词shallowsuperficial

4. A2formal

   Low in pitch; not high or shrill.

   低沉的

   • He has a deep, resonant voice.
   • The deep sound of the drum echoed through the hall.
   • She spoke in a deep, calm tone.

   同义词bassgraveheavylowresonantsonorousthroaty

   反义词highsharpshrill

• 副词，表示“向下很远”或“到很大深度”，常用于引申义，表示程度深或做事 thorough（如“深挖”“深呼吸”）。英语中该副词与形容词同形，不带 -ly。

An adverb meaning 'far down' or 'to a great depth,' often used figuratively to indicate intensity or thoroughness (e.g., 'dig deep,' 'breathe deep'). It is identical in form to the adjective and does not take the -ly ending.

1. To a great depthA2formal

   At or to a considerable distance below the surface.

   深深地

   • The submarine dove deep into the ocean.
   • They dug deep to find the buried treasure.
   • The roots of the tree grow deep into the ground.

   同义词deeply

   反义词shallowsuperficially

2. Intensely or profoundlyB2formal

   In a way that involves strong emotions or deep thought.

   深深地

   • He felt deep in his heart that he was right.
   • She thought deep about the meaning of the poem.
   • They were deep in conversation for hours.

   同义词deeplyintenselykeenlyprofoundlyseriouslystronglythoroughly

   反义词lightlyshallowlysuperficially

3. Far into a period of timeB1informal

   Late or far into a particular period, especially night or winter.

   深夜

   • They stayed up deep into the night talking.
   • The festival continued deep into the winter months.
   • He worked deep into the evening to finish the report.

   同义词farwell

• 名词，指深的部位、区域或某物最深的部分，尤指水域的最深处或某种深刻的状态。

A noun referring to a deep place, area, or part of something, especially the deepest part of a body of water or a profound state or condition.

1. The deep part of the seaB2formal

   The part of the ocean or sea that is far from the shore and has great depth.

   深海

   • The ship sailed into the deep.
   • Creatures of the deep are rarely seen by humans.
   • They explored the mysteries of the deep.

   同义词abyssmainoceansea

   反义词shoalsurface

2. The middle or most intense partB2formal

   The most intense, profound, or central part of something.

   深处

   • He was in the deep of his thoughts.
   • She found herself in the deep of the forest.
   • In the deep of winter, the lake freezes over.

   同义词bosomcentercoreheartmiddlemidstthick

   反义词edgemarginperipherysurface