This Lego Star Wars Lightsaber is not available for purchase. By taking part in this special event, Star Wars fans can take home something that money literally cannot buy. The only catch is that you're limited to one build per participant, but come on — you can't just turn up and stock up on these exclusive Star Wars sets for free. That would be nice, but that's not the Way of the Force.
就像智能手机之前融合掉了卡片机、随身听和 PDA 一样，现在的手机也还在不断融合外设配件的功能：抗反射涂层如此，防窥膜亦如此。
。夫子对此有专业解读
Leaky ReLU: 对负区间引入一个小斜率，避免神经元死亡
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