User-agent: *
Crawl-delay: 30

User-agent: Baiduspider
Disallow: /

User-agent: MJ12bot
Disallow: /

User-agent: YandexBot
Disallow: /

User-agent: Yandex
Disallow: /

User-agent: magpie-crawler
Disallow: /

User-agent: AhrefsBot 
Disallow: /