User-agent: msnbot 
Crawl-delay: 20

User-agent: Slurp
Crawl-delay: 5

User-agent: baiduspider
Crawl-delay: 20

User-Agent: MJ12bot
Crawl-Delay:   10

User-agent: Yandex
Crawl-Delay: 10 

User-agent: *
Allow: *