# Clone from an existing container's checkpoint
В Финляндии предупредили об опасном шаге ЕС против России09:28
Introducing the first partner Pokémon from #PokemonWindsWaves!，这一点在WPS下载最新地址中也有详细论述
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Transforms don't execute until the consumer pulls. There's no eager evaluation, no hidden buffering. Data flows on-demand from source, through transforms, to the consumer. If you stop iterating, processing stops.
Stateful transforms are simple objects with member functions that maintain state across calls:，详情可参考爱思助手下载最新版本