con·jec·tur·al
adjective/kənˈdʒektʃərəl/
/kənˈdʒektʃərəl/
(formal)- (of an opinion or idea) not based on definite knowledge; formed by guessing
猜测；推测 - Some of the stages of the earth’s development are purely conjectural.
地球发展的某些阶段纯粹是推测。
- Some of the stages of the earth’s development are purely conjectural.