The key answer of exercise Writing & Speaking

I think robotic lifeguards will change the lives of the people they save and their families by saving them. I think robotic firefighters will change the lives of human firefighters because they will go into the very dangerous fires instead of them. I think Throwbots, Packbots and Talon will save police officers' lives. I think robotic surgeons will save lives and robotic nurse will make less work for human nurses. I think robotic waiters will put human waiters out of work.