What are the keywords in the following sentence? portrait of smiling woman at the waterfront
portrait, smile, waterfront

What are the keywords in the following sentence? female dentist getting ready for teeth treatment with microscope at the dental clinic .
clinic, dentist, treatment

What are the keywords in the following sentence? customers shop for groceries in a supermarket
grocery, shop, supermarket

What are the keywords in the following sentence? dramatic red sky and sun caused by dust in the atmosphere
cause, sky, sun