作者在二十年前被任命为在一个火山学家的翻译：Author in the 20 years before being appointed as a volcano scientist 什么意思？中文翻译英文，英文翻译中文，怎么说？

青云英语翻译

Twenty years ago the author was appointed as a volcanologist

Author in the 20 years before being appointed as a volcano scientist

The author in 20 years ago by the appointment is a volcanologist

The writer, in 20 years ago was appointed a volcanolok

Author in the 20 years before being appointed as a volcano scientist