trace
vt.跟踪，追踪;追溯，探索;探索;查找
vi.沿着一小径或道路前进;可以追溯的
n.痕迹，踪迹;微量，极少量;(脉)迹;痕迹
复数：traces第三人称单数：traces过去式：traced过去分词：traced现在分词：tracing
Trace back
means the same as trace.trace back 同 trace
Britains Parliament can trace its history back to the English Parliament of the 13th century...
英国议会的历史可以追溯到13 世纪的英格兰议会。
She has never traced back her lineage, but believes her grandparents were from Aberdeenshire.
她从没有查考过自己的家系，不过她认为她祖父母来自阿伯丁郡。
例句
1.Objective to determine the content of trace elements of ganoderma lucidum.
目的测定灵芝孢子粉中微量元素的含量。
2.Trace the object diagram of the service.
跟踪服务的对象图。
3.Like trace from the victims body?
像是留在受害者身上的痕迹?
4.Can we trace the source?
咱们能追踪来源吗?
5.On active uptake of trace elements governed.
无痕量元素的主动吸收。