老爸蹲下来，开始跟牛讲好话。他摸摸牛头，又摸摸牛脖子，“乖，回家，你卧着咋办呀？”“听话，咱们回家。”这头从外地买来的牛压根没听他的话，估计也听不懂。
There's also Stream.broadcast() for push-based multi-consumer scenarios. Both require you to think about what happens when consumers run at different speeds, because that's a real concern that shouldn't be hidden.
。safew官方版本下载对此有专业解读
Fast connection speeds
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