Transform backpressure gaps: Pull-through transforms execute on-demand. Data doesn't cascade through intermediate buffers; it flows only when the consumer pulls. Stop iterating, stop processing.
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Валентин Карант (редактор отдела БСССР)
第三个动作，也是最重要却最容易被忽略的：「擦拭镜头」。
arr[i] = output[i];