safe conduct
noun /ˌseɪf ˈkɒndʌkt/
  /ˌseɪf ˈkɑːndʌkt/
(also safe passage)
 [uncountable, countable]- official protection from being attacked, arrested, etc. when passing through an area; a document that promises this安全通行权;安全通行证;通行许可证 - The guerrillas were promised safe conduct out of the country.游击队员得到承诺,可以安全离开这个国家。 
- to be granted a safe conduct获准安全通行 
 
- The guerrillas were promised safe conduct out of the country.