And then we've got to be able to have systems that can find every single case, every contact of those cases, and begin to track the transmission chains so that you can stop transmission.
然后我们必须建立一个体系， 能够找到每一宗病例， 以及那些病例的所有联系人， 并且开始追踪传播链， 这样才能阻止传播。