Stateful transforms are simple objects with member functions that maintain state across calls:
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There are two main types of smoke alarm tech, says Raman Chagger, principal consultant at BRE, the Building Research Establishment. Ionisation-based systems use a tiny amount of radioactive material to charge, or ionise, particles in the air which flow between two small plates. Should smoke interrupt that flow of charged particles, the alarm goes off.，详情可参考搜狗输入法下载
Both countries blamed the other for not engaging seriously in diplomacy.