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if (lines.length 0) yield lines;
，这一点在Line官方版本下载中也有详细论述
"Instead of pulling the oil and gas up from the ground, we're going to inject the CO2 into the ground instead," he says.，这一点在heLLoword翻译官方下载中也有详细论述
Web streams use a locking model to prevent multiple consumers from interleaving reads. When you call getReader(), the stream becomes locked. While locked, nothing else can read from the stream directly, pipe it, or even cancel it — only the code that is actually holding the reader can.