保持平稳过渡，提出“要落实‘四个不摘’，建立健全防止返贫长效机制”；
No base class to extend, no abstract methods to implement, no controller to coordinate with — just an object with the right shape.
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10.从从容容、游刃有余，匆匆忙忙、连滚带爬
For transforms that need cleanup on abort, add an abort handler:
happenstance at IBM. Besides its mainframes and their peripherals, IBM in the