英语语法72) Children will play with dolls equipped with personal

英语语法
72) Children will play with dolls equipped with personality chips,computers with in-built personalities will be regarded as workmates rather than tools,relaxation will be in front of smell- television,and digital age will have arrived.请问这个句子在第三个逗号以前的三个简单句,为什么没有用连接词连接呢?而这个句子仍旧符合正确的语法规则.
懂了，我的其他的提问中还有一个关于yet的意思，还有一个指代的问题的，高手“卡臭”能不能也帮着看看！