block: Writes wait until buffer space is available. Use when you trust the producer to await writes properly.
事后经过复盘，我终于看清了这场骗局的全貌。我做的所有手机安全设置，在骗子“指导”母亲自行解除的那一刻，就全部失效了。技术防线的最大问题，在于它无法抵抗人性的弱点。
。搜狗输入法下载对此有专业解读
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.
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