This form of tracking is called contact tracing.

这种追踪方式被称为“接触者追踪”。

" How did you trace it, then? "

" ，怎样追查出来的呢？"

There was no trace of the fog now.

这会儿雾已经消失得无影无踪。

Some of them have no trace of a home.

他们中有些人没有家的任何线索。

Some still showing traces of vivid colour.

有些仍能看出昔日的明艳色彩。

There's no trace of that PFAS molecule left.

没有任何 PFAS 子留存的痕迹。

Hope they can't trace it back to you.

希望不会查到头上。

The first known kites have been traced back to what country?

已知的最早的风筝可以追溯到哪个国家？

Could it be a trace of primitive Martian biology?

会是原始的火星生物吗？

And the change can be traced to Swedish hunting regulations.

这种变化可以典的捕猎规定中找出缘由。

Many people will leave the universe without a trace.

很多人离世后，不留下一丝痕迹。

Among the higher animals there is no trace of them.

人首创了这些特点，而高级动物中没有这些特点的痕迹。

In a week, there would be no trace of her.

一个星期之内就再也找不到这个地方了。

The police were unable to find any trace of the thief.

警察找不到小偷的任何踪迹。

But maybe most importantly, we can trace changing levels of carbon dioxide.

但也许最重要的是，我们可以追踪二氧化碳含量的变化。

This one, you can still see a few traces of black paint.

这个面具上依然能看到黑色颜料的痕迹。

It's the first physical trace of a Denisovan found outside Siberia.

这是西伯利亚以外发现的第一个丹尼索瓦人的物理痕迹。

But many others could either not be traced or were from overseas.

不过，还有许多团体要无法追踪，要位于海外。

Is that how long it takes for Rick to trace my location?

克追踪我的地址，需要的时间长吗？

And it also discovered traces of methane.

是的，火星地表有有机物。