translation.en: There is a problem with vaccines around the world not getting to patients. And the reason is that the refrigeration somehow gets broken; what's called the "cold chain" gets broken.
translation.zh: 现在有一个难题 使得很多疫苗无法送到病人手中 原因是没办法保持持续冷藏的状态 这是所谓的"低温链"中断