3. 品牌出海与合规红利： 传统的“铺货型”卖家生存空间被严重压缩，而具备品牌基因、高品质产品（如美容电器、母婴用品、办公电子）且能够灵活响应市场需求的“小单快反”型卖家，正获得更高的利润率和平台流量倾斜 [18, 41]。
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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if (chunks === null) {。51吃瓜对此有专业解读
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