（三）国际运输服务、航天运输服务、对外修理修配服务。
The problem compounds in pipelines. Each TransformStream adds another layer of promise machinery between source and sink. The spec doesn't define synchronous fast paths, so even when data is available immediately, the promise machinery still runs.
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offset += bytesToWrite;，更多细节参见heLLoword翻译官方下载
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