What are the keywords in the following sentence? cranes for loading containers at the port
container, crane, port

What are the keywords in the following sentence? the game was officially launched on operating system last week
game, operate, system

What are the keywords in the following sentence? members gathered in a conference room for a meeting
gather, meeting, member

What are the keywords in the following sentence? trees of a japanese garden in the modern city
city, garden, tree