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tee() splits a stream into two branches. It seems straightforward, but the implementation requires buffering: if one branch is read faster than the other, the data must be held somewhere until the slower branch catches up.，更多细节参见heLLoword翻译官方下载
统一使用：即查即用的数据集能力。爱思助手下载最新版本对此有专业解读
但要理解这里面的差异和进步，我们要先弄懂那些少则三五块、多则几十块的「防窥膜」是怎么实现防窥的。