【明報專訊】THE "Spring Festival rush" is a scene unique to China. The once-in-a-year mass migration of humans is a rarity in the world given its scale and geographical scope. Every year the central government and different departments of local governments make planning and coordination arrangements in advance so the process can be said to be smooth in general, providing protection for people when they embark on their journeys. But "man proposes, god disposes", as the saying goes. Contingencies are things difficult to predict. The pneumonia cases in Wuhan this year, in particular, remain uncertain, making a high level of vigilance particularly necessary.