His father claims to be able to trace the family back to many centuries ago.

We have lost all trace of him.

我们找不到他的踪迹.

Brand's keen ear caught the trace of an accent.

布兰德敏锐的耳朵听出了口音。

There isn't a trace of a smile on her face.

她脸上没有一丝笑容.

Staff will be able to trace calls at the touch of a button.

工作人员一摁按钮便可以追踪电话。

They could not trace him.

他们找不到他.

He wanted to trace roughly.

他想草草地勾画.

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。

There was not a trace of cynicism in his voice.

他的语气里没有一丝挖苦.

They feared some undetected trace of poison.

他们担心一些未被识破的投毒痕迹.

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

早上将近8点时有人看到两名男子离开那所房子，警方急于找到他们。

He has only been able to trace out the outline of the plan, without any details.

他只能提出这一计划的要点, 拿不出任何细节.

They have spent ages looking at the map and can't find a trace of anywhere called Darrowby.

他们对着地图细看了许久也没能找到那个叫达罗比的地方的影踪。

Put just a trace more salt in my soup.

我的汤里再放一点盐吧! vi,

You'd better give her memory a prod.

你最好提醒她一下.

He'd a good memory for faces, and he was sure he hadn't seen her before.

他对别人的长相过目不忘，他确信自己以前没有见过她。

This story had lodged in his memory.

这个故事已深植在他记忆中.

All memory of the past has faded.

往日的记忆已成云烟.

He has a good memory.

他记忆力好.

It is still in my memory.

这事我还记得真切.

What's the chemical symbol for mercury?

汞的化学元素符号是什么？