If I were a scientist, I would build a long tunnel between the seabed and the mainland. I also want to build buildings in the ocean, and cars can run in the underwater world like submarines.
If I were a scientist, I would like to build a car that can be driven automatically by machines instead of hands, and run in the street, so that the driver will be much more relaxed. If I were a scientist now, I would study some robots that can do housework, so that every household can have such robots, so that people can get rid of the complicated housework and do what they want. I will also study an inexhaustible battery, so that robots can help people do housework forever.
If I were a scientist, I would work hard. ......