Wash them in cold water to remove all traces of sand.

用冷水清洗它们以清除所有的沙子。

The technique could scan luggage at airports for traces of explosives.

该技术可以用在机场扫描行李，查出爆炸物的踪迹。

said without a trace of irony.

十分真诚地说。

Bronx residents who trace their families back to Dutch settlers.

将自己的家族追溯到荷兰移民者的布朗克斯居民。

Britain's 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。

The traditional format of the almanac can be traced back for at least a thousand years.

天文年历的传统格式可以追溯到至少一千年前。

One day he left, disappeared without a trace.

一天他离开了，消失得无影无踪。

The exhibition traces the history of graphic design in America from the 19th century to the present.

这个展览会追溯了从19世纪至今美国平面设计的历史。

The psychiatrist successfully traced some of her problems to severe childhood traumas.

精神病专家将她的一些问题归因于儿时严重的精神创伤。

Police are anxious to trace two men seen leaving the house just before 8am.

警察急切想找到在早上将近8点时被人看到离开那幢房子的两名男子。

I traced the course of the river on the map spread out on my briefcase.

我在公文包上铺展开的地图中勾画出了这条河的流向。

She learned to draw by tracing pictures out of old storybooks.

她通过描摹旧故事书上的图画学会了绘画。