5个ist作为后缀的单词

　　例句：

　　He determined that he would become an assistant scientist.

　　他决心要当一名科学家的助理。

　　A scientist must be objective.

　　科学家必须客观。

　　The scientist argued that his discovery had changed the course of history.

　　这个科学家举出理由证明他的发现已使历史改观。

　　She has become a famous scientist.

　　她成为著名科学家。

　　In the middle of his tests, the scientist burst on the truth.

　　在实验过程中，那个科学家突然发现了真相。