I. trace [treıs] 动词 trans
| I | trace |
|---|---|
| you | trace |
| he/she/it | traces |
| we | trace |
| you | trace |
| they | trace |
| I | traced |
|---|---|
| you | traced |
| he/she/it | traced |
| we | traced |
| you | traced |
| they | traced |
| I | have | traced |
|---|---|---|
| you | have | traced |
| he/she/it | has | traced |
| we | have | traced |
| you | have | traced |
| they | have | traced |
| I | had | traced |
|---|---|---|
| you | had | traced |
| he/she/it | had | traced |
| we | had | traced |
| you | had | traced |
| they | had | traced |
单语范例（未经PONS编辑处理）
It is a hard, brittle, bluish-white transition metal in the platinum group that is found as a trace element in alloys, mostly in platinum ores.
en.wikipedia.org Unfortunately, the editors made no systematic attempt to trace or indicate the origin and first use of a term or phrase.
en.wikipedia.org Amazingly there is no trace of errata or omission on any of the wood blocks.
en.wikipedia.org In modern times there is no above-ground trace left of these derricks.
en.wikipedia.org Aside from being inefficient, sodium as a desiccant (below its melting point) reacts slowly with trace amounts of water.
en.wikipedia.org