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18 of 20 within-ecosystem
，这一点在heLLoword翻译官方下载中也有详细论述
（二）本法第十二章第二节规定的船舶油类污染损害责任的赔偿请求；
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.