減少美軍在歐洲駐軍並轉向聚焦中國
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.
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2.7 SELU（Scaled Exponential Linear Unit）
return _call.call(origSet, this, v);