Understanding the algorithm of the regression tree is difficult.

A decision tree is a part of machine learning and a model for classifying or regressing data.

This forest tree has been alive for over 100 years.

I have been to Benxi city in China.

I bought a new book.

His main work describes his life experiences and philosophy in detail.

She always has her hair cut by her regular stylist at the beauty salon.

My pocket book collection can be read anytime during travel.

What is the main verb of this sentence?

He gifted me a signed copy of his new book.