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There are many reasons why people pursue hobbies.

For many people, the challenge of learning
a new skill or achieving a difficult goal is their primary motivation.

Other people enjoy hobbies for the communities they can become a part of or the friendships they can make there.

Still others enjoy hobbies because they can lose track of time and be in the moment, similar to being in a meditative state.

Some people even end up making contributions to society through their hobbies, oftentimes unexpectedly.

It is the physical, mental, or emotional experience, or even a combination of them that makes a hobby rewarding and fun.

Perhaps it should be called “pleisure.”

For many people, the challenge of learning a new skill or achieving a difficult goal is their primary motivation.

문장의 핵심 주어는 전치사구(of learning a new skill)와 동명사구(achieving a difficult goal)의 수식을 받는 the challenge로 단수이므로, 동사 is가 쓰였다.

Other people enjoy hobbies for the communities they can become a part of or the friendships they can make there.

they can become a part of는 the communities를 수식하는 관계절이다.

they can make there는 the friendships를 수식하는 관계절이다.

It is the physical, mental, or emotional experience, or even a combination of them that makes a hobby rewarding and fun.

It ... that 구문이 사용되어 강조의 의미를 나타낸다. 여기에서는 the physical, mental, or emotional experience, or even a combination of them이 강조되고 있다.

Amateurs in many other fields have made important contributions through their hobbies, such as amateur programmers developing new technologies, amateur writers publishing their work in local magazines, amateur history researchers preserving historical sites.

developing new technologies, publishing their work in local magazines, preserving historical sites는 각각 앞의 amateur programmers, amateur writers, amateur history researchers를 수식하는 분사구이다.