This is fundamentally different from Web streams' pipeThrough(), which starts actively pumping data from the source to the transform as soon as you set up the pipe. Pull semantics mean you control when processing happens, and stopping iteration stops processing.
行至时间的静深处，光线柔软了，物理空间叠合了，千年前的山川和人物奔来眼底。雨过河源，星沉海底，最遥远的事物变得触手可及。那已是中国文化的一处源头，你静心，屏息，内心一片澄明与虔敬。
。关于这个话题，Line官方版本下载提供了深入分析
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Parents opposing plans told they can home school their children if they object to sending them to state schools