A tracing is a copy you make by putting thin paper over a picture or a map and drawing along the lines you can see through it. The copy itself is the tracing — 'I made a tracing of the map'.

by putting thin paper over a picture or a map把薄紙蓋在圖片或地圖上，and drawing along the lines you can see through it沿著透過紙看到的線描下來，A tracing is a copy you make這樣做出來的複製品就叫做tracing。The copy itself is the tracing這個複製品本身也叫做tracing，'I made a tracing of the map'就像『I made a tracing of the map』（我畫了一張地圖的描圖）這樣的說法。

The thin see-through paper for doing this has its own name, tracing paper, and that pairing is where most students meet the word.

The thin see-through paper for doing this用來描圖的這種薄透明紙 has its own name, tracing paper,有自己的名字，叫做tracing paper（描圖紙） and that pairing is where most students meet the word而大多數學生就是從這個組合認識這個字的。

'Tracing' is also just the -ing form of the verb 'trace', and 'trace' has several jobs, so the same shape turns up meaning quite different things: tracing a drawing (copying it), tracing a phone call (following it back to find where it came from), tracing your family history (following it back in time), contact tracing (finding everyone a sick person met). All of these share one picture — following a line back along itself. Only the first one gives you a physical object you can hold.

'Tracing' is also just the -ing form of the verb 'trace'tracing其實也只是動詞trace的-ing形式，and 'trace' has several jobs而trace這個字有好幾種用法，so the same shape turns up meaning quite different things所以同樣的字形會出現在完全不同的意思裡：tracing a drawing (copying it)tracing a drawing（描一幅畫，也就是複製它）、tracing a phone call (following it back to find where it came from)tracing a phone call（追查一通電話，找出它是從哪裡打來的）、tracing your family history (following it back in time)tracing your family history（追溯你的家族歷史，往回找到過去）、contact tracing (finding everyone a sick person met)contact tracing（疫調，也就是找出一個病人接觸過的所有人）。All of these share one picture這些用法其實都共享同一個畫面，following a line back along itself就是沿著一條線往回追。Only the first one gives you a physical object you can hold但只有第一個意思會給你一個實際可以拿在手上的東西。