向心城市化、城郊化、逆城市化和再城市化四个连续的变质阶段构成大都市的生命周期。
Centralization, Sub urbanization, Counter urbanization and Re urbanization are the main phases in the life cycle of metropolis.
准备一个防洒的咖啡杯，泡一杯自己最爱的现磨咖啡，再备一些不容易变质的小零嘴（干果或坚果，果汁饮料，或者脆饼干）。
Bring a spill-proof coffee cup filled with your favorite brew to the office, and have a bag of nonperishable snacks on hand (dried fruit and nuts, juice boxes, or pretzels).
锰矿的富集经历了沉积作用、变质作用和表生再富集作用。
Mn ores were concentrated through sedimentation, metamorphism and supergene enrichment.
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