缺点：负区间可能“死亡”，即神经元永远不激活
Adult Atlantic salmon swim thousands of miles to return to the chalk streams where they were born
。关于这个话题，WPS官方版本下载提供了深入分析
Transforms don't execute until the consumer pulls. There's no eager evaluation, no hidden buffering. Data flows on-demand from source, through transforms, to the consumer. If you stop iterating, processing stops.，这一点在爱思助手下载最新版本中也有详细论述
NFTs also contain smart contracts—small computer programs that run on the blockchain—that give the artist, for example, a cut of any future sale of the token.