n.

1. 痕迹；遗迹[C][U]
   The archaeologists found some traces of an ancient civilization in that area.

   考古学家们在那个地区发现了一些古代文明的遗迹。

2. 丝毫，微量[C]
   There was barely a trace of salt in the soup.

   汤里简直一点盐也没有放。

   He always spoke with a trace of sarcasm.

   他说话总带着一丝讽刺。

3. （记录仪器上存留的）图形，记录[C]

vt.

1. 跟踪；追踪[（+to）]
   The police traced the criminal.

   警察追踪罪犯。

2. 查出，探出
   The post office tried to trace the lost letter.

   邮局设法查出那封丢失的信。

3. 追溯；查考[（+back/to）]
   The book traces the development of philosophy.

   该书追溯了哲学的发展过程。

4. 描绘；勾出……的轮廓[（+out）]
5. （费力，细心地）写（字）
6. 描摹，摹写；复写
   The kids are learning to trace the letter.

   孩子们学描字母。

vi.

1. 沿着路走
2. 上溯[（+to）]
   His fear of snakes traces back to an experience in his childhood.

   他对蛇的惧怕溯自他孩童时的一次经历。

n.

1. 挽绳，缰绳
   kick over the traces

   摆脱控制；不顺从

v.

1. find by investigation.
   ▸find or describe the origin or development of.
2. follow the course or position of with one's eye, mind, or finger.
3. copy (a drawing, map, or design) by drawing over its lines on a superimposed piece of transparent paper.
   ▸draw (a pattern or line).
4. give an outline of; describe.

n.

1. a mark, object, or other indication of the existence or passing of something.
   ▸a physical change in the brain associated with a memory.
2. a very small quantity.
   ▸a barely discernible indication:

   a trace of a smile.
3. a line or pattern corresponding to something which is being recorded or measured.
   ▸the projection or intersection of a curve on or with a plane.
4. a procedure to trace something, such as the source of a telephone call.
5. Mathematics  the sum of the elements in the principal diagonal of a square matrix.
6. N. Amer. & W. Indian a path or track.

n.