Polyolefin is a type of plastic widely used in the chemical industry.

Cycloolefins play an important role in organic chemistry.

Thank you for the delicious dinner, it was a feast.

Thank you for the delicious dinner, it was a feast.

He was half dead from fatigue.

He is the type of person who understands ten from hearing one.

Since he is always laughing, it can be said that 'fortune comes in by a merry gate'.

He spent his money as quickly as 'a duck comes bearing green onions', which means a fool and his money are soon parted.

Thank you for your hard work until late.

He is exactly in the state of 'A frog in a well does not know the vast ocean.'