chemistry (branch of natural science)

a piece of research, a study, investigation

to research, to study

club sandwich

chemistry (branch of natural science)

one day

one, 1 / the first in order, foremost / the beginning / the best / a kind of; one of something / (card games) an ace / unity / the bottom string of a shamisen or other Japanese musical instrument

story, genre (type of story)

(non-productive, with adjectives)

(informal) Alternative form of 物 (mono, “thing”)