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.
但对后续的发展来说，动销也是最关键的。。PDF资料对此有专业解读
Where to Buy: $49.99 $29.99 at Target。关于这个话题，PDF资料提供了深入分析
ВсеПрибалтикаУкраинаБелоруссияМолдавияЗакавказьеСредняя Азия，详情可参考Line官方版本下载