People will produce the machine written in the book in 50 years.改为被动语态但是PEOPLE就没有了啊,还应该有BY PEOPLE

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People will produce the machine written in the book in 50 years.改为被动语态但是PEOPLE就没有了啊,还应该有BY PEOPLE
People will produce the machine written in the book in 50 years.改为被动语态
但是PEOPLE就没有了啊,还应该有BY PEOPLE

People will produce the machine written in the book in 50 years.改为被动语态但是PEOPLE就没有了啊,还应该有BY PEOPLE
The machine written in the book will be produced in 50 years.

it is understood that the machine will be produced by people. thus, "by people" can be omitted.