trace 四级六级考研GRE

It leaves no trace after fire extinguishing.It replaces for alkylogen annihilator.

灭火后不留痕迹，是取代卤代烷灭火器的替代品。

Trace an analogy between pastoral poetry and landscape painting.

找出田园诗风景画之间的相似之处。

Paw print, or pugmark, tracing is another common technique for counting tigers.

爪印老虎的足迹同样是常用的计算老虎数的方法。

The contents of trace elements and mesne elements changed gently in the growing season.

中元素元素的含随着生长有所增加，但是波动不大。

A newly-developed microdistribution analysis method for trace elements——synchrotron radiation X-ray fluorescence analysis is introduced.

本文介绍了一种新型的元素区分析方法——同步辐射X射线荧光分析法。

The seeds contain hydrocyanic acid and a trace of a toxalbumin.

种子包含氢氰酸的毒白蛋白。

All trace of his working-class background was deliberately obscured.

他工人阶级出身的所有痕迹都给有意地隐藏起来了。

There was not a trace of cynicism in his voice.

他的语气里没有一丝挖苦。

Kelp is rich in vitamins and trace elements.

大型褐藻富含维他命元素。

We traced the trouble to a faulty transformer.

我们查出故障出在一个有毛病的变压器上。

The family has traced its ancestry to the Norman invaders.

这个家族将自己的世系追溯到诺曼征服者。

There are traces of poison in the fish.

这种鱼体内有的毒素。

Even the youngest child can trace over the shapes of the letters with a pencil.

即使小孩子也能用铅笔描出字母。

The names were traced out in stark black print.

这些名字是用醒目的黑体字印出的。

In spite of the mist the sailors could trace the outline of an island.

尽管有雾, 水手们还能依稀看出一个岛屿的轮廓。

They traced the criminal to a house in the city.

他们追踪罪犯到了城里的一座房子里。

We have lost all trace of him.

我们找不到他的踪迹。

His family traces back to the Norman Conquest.

他的家世可追溯到诺曼人征服英国的时代。

Bob's book traces his flying career with the RAF.

鲍勃的书追溯了他在英国皇家空军的飞行生涯。

The custom traces to the time of the Warring States.

这个风俗可上溯到战国时期。