This movie is based on the original work of a famous novel.

Creating a new recipe is a series of trial and error.

He repeated trial and error to create a new recipe.

I am planning to go to Gangwon in Korea next week.

He has no knowledge about anal sex.

He started training his anal sphincter.

He is majoring in syntax at university.

He is an expert in enzymology and conducts many researches.

You can use spectroscopy to examine the components of a substance.

The population density of this area is very high.