Our efforts to trace him turned up nothing.
我们辛辛苦苦跟踪他，却无功而返。
How far back can you trace your family tree?
你的家谱可以追溯到多少代？
He was able to trace his ancestry back over 1 000 years.
他可追祖溯宗至1 000年以前。
Staff will be able to trace calls at the touch of a button.
员工只要一按按钮就可以追踪电话。
"The most important thing is to be honest," she says, without the trace of a blush.
“最重要的是要诚实。”她说道，丝毫不脸红。
In order for their computers to trace a person's records, they need both the name and address of the individual.
为了使他们的计算机跟踪某个人的记录，他们需要这个人的名字和地址。
Can one trace this same pattern far back in prehistory?
我们能把同样的这种模式追溯到遥远的史前吗？
Each time this initial memory trace is "replayed", it becomes even stronger.
每次“重播”这段原始记忆轨迹时，它都会变得更加深刻。
This will add some variety to the trace output to illustrate the power of the technique.
这样将为跟踪输出添加一些变化，以说明该技术的强大能力。
One way to determine your foot shape is to do a "wet test"—wet your foot, step on a piece of brown paper and trace your footprint.
有个能确定你的脚型的方法就是做“湿足测试”——把你的脚浸湿，踩在一张牛皮纸上，然后勾画出你的脚印。
They could trace the growth and shrinkage of continental glaciers, even in parts of the ocean where there may have been no great change in temperature—around the equator, for example.
他们可以追踪大陆冰川的生长和收缩，即使是在温度变化不大的海洋区域——比如，赤道附近。
Rather than merely a sign, it is the root from which we can trace back to our ancestor, the tie that helps bind us to other members of the same clan, the dignity most people hope to live for.
它不仅仅是一种标志，更是我们可以追溯到祖先的根源，是将我们与同族其他成员联系在一起的纽带，是大多数人希望为之而活的尊严。
The ship had vanished without (a) trace.
那艘船消失得无影无踪。
She could trace her family tree back to the 16th century.
她能把本族家谱追溯到16世纪。
Police searched the area but found no trace of the escaped prisoners.
警方搜索了那一地区，但未发现越狱逃犯的任何踪迹。
他消失得无影无踪。
The trace showed a normal heart rhythm.
描记图表明心率正常。
One day he left, disappeared without a trace.
有一天他离开了，消失得无影无踪。
A trace of hesitancy showed in Dr. Stockton's eyes.
一丝迟疑出现在斯托克顿医生的双眼中。
They can trace their lineage back to the 18th century.
他们的家族可以直接追溯到18世纪。
The prince's manner was informal, without a trace of pomposity.
王子的态度平易谦和，没有一点傲气。
Years of living in England had eliminated all trace of her American accent.
她因多年居住在英国，美国口音已荡然无存。
Police are anxious to trace two men seen leaving the house just before 8am.
警察急切想找到在接近早晨8点前被人看到离开那幢房子的两名男子。
Despite a nationwide hunt for the kidnap gang, not a trace of them was found.
尽管已对这帮绑架团伙实行了全国范围的大搜捕，但丝毫没有发现他们的蛛丝马迹。
They have spent ages looking at the map and can't find a trace of anywhere called Darrowby.
他们已花了很长时间察看地图，却怎么也找不到一个叫“达罗比”的地方。
One can trace such expeditions back to ancient Sumeria, the earliest known Middle Eastern civilization.
这样的探险可以追溯到古苏美尔时期，这是已知的最早的中东文明。
If you bring a road map for each child, they can trace your trip in pen or crayon and draw landmarks on the map themselves.
如果你给每个孩子带一张路线图，他们可以用钢笔或蜡笔记录你的旅程，并在地图上自己画路标。
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