This form of tracking is called contact tracing.

这种追踪方式被称为“接触者追踪”。

They need to go back and trace those people. It's called contact tracing.

人们就需要回去调查那些人。这就是所谓的接触者追踪。

This form of tracking is called contact tracing. It requires a lot of workers to do it.

这种追踪被称为接触者追踪。这需要大量工作人员。

Released in 2018, RTX is Nvidia's next big move in graphics with a new technology called ray tracing.

RTX于2018年发布，是Nvidia在图形领域的下一个重大举措，采用了一种称为光线追踪的新技术。

There are many different ray  tracing algorithms used to render scenes, but the current industry standard in TV  shows and movies is called path tracing.

有许多不同的光线追踪算法用于渲染场景，但目前电视节目和电影的行业标准称为路径追踪。