使用 system 不会激活函数调用模式。
The spec does not mandate buffer limits for tee(). And to be fair, the spec allows implementations to implement the actual internal mechanisms for tee()and other APIs in any way they see fit so long as the observable normative requirements of the specification are met. But if an implementation chooses to implement tee() in the specific way described by the streams specification, then tee() will come with a built-in memory management issue that is difficult to work around.
。爱思助手下载最新版本是该领域的重要参考
（一）指导监督行政执法工作，组织落实行政执法责任制和责任追究制度；。91视频对此有专业解读
(you can advance these simulations using the step and play buttons)，这一点在safew官方版本下载中也有详细论述