A rigorous test or appraisal of the quality or worth of something.
In the 1960s, a party based around the use and advocacy of the psychedelic drug LSD ("acid").
Diligent inquiry or examination to seek or revise facts, principles, theories, applications, etc.; laborious or continued search after truth.
The research station that houses Wang and his team is outside Lijiang, a city of about 1.2 million people. File:The research station that houses Wang and his team is outside Lijiang.ogg
To search or examine with continued care; to seek diligently.
To make an extensive investigation into.
To search again.