由and ,not only ...but also ,neither ...nor ,then ,or ,either ...or ,otherwise,but ,still,however.yet ,while,so ,for ,therefore...连接的句子,基本结构是：分句+ 连词+ 分句
由and ,not only ...but also ,neither ...nor ,then ,or ,either ...or ,otherwise,but ,still,however.yet ,while,so ,for ,therefore...连接的句子,基本结构是：分句+ 连词+ 分句