The person had not answered telephone calls from New York City's contact tracing program.

此人没有接听纽约市接触追踪项目打来的电话。

Comparing U.S. state and city contact tracing programs is difficult because they vary or differ widely in what they release.

美国各州和各城市的接触追踪项目计划进行比较是十分困难的，因为它们在发布内容上千差万别。

And three countries with a strong testing and tracing program - South Korea, Germany and China - already have seen new outbreaks after stay-at-home orders were eased.

拥有强大检测和追踪程序的韩国、德国和中国在放宽居家令后，先后出现了新增疫情。