QueryLang: the language of the query string; this value must comply with ISO 639 and ISO 3166 standards. (this parameter is optional; the default value is the server locale.)

queryLang：查询字符串的语言；该值必须与ISO 639和ISO 3166标准一致(该参数是可选的；默认值为服务器的位置)。

youdao

This parameter is optional and can be specified as a string, integer, or hexadecimal value corresponding to the LCID of a language.

此参数是可选参数，可以指定为与某种语言的LCID对应的字符串、整数或十六进制值。

youdao

The basic idea is getting the proper language at installation time, or through the use of optional packs.

基本的思路是：在安装时获取合适的语言，或者通过使用可选包来改变程序语言。

youdao

Yet there is also talk of introducing optional Kurdish-language classes in government schools.

ECONOMIST: Turkey and the Kurds