Koro koro

Koro koro is onomatopoeia of rolling things.
also used as noun for a cleaning sticky paper tape.

i.e)
Jp: Ringo ga sakamichi wo KORO KORO korogatteiru.
(りんごがさかみちをころこところがっている)
En: An Apple is rolling down on the down hill.

i.e)
Jp: KORO KORO de huku ni
tuita kami no ke wo totta.
(コロコロでふくについたかみのけをとった)
En: I took off hair on my cloths with a cleaning tape.



koro koro tape

Doki doki

Doki doki is onomatopoeia for throbbing heart (when you are very nervous,excited.)

i.e.)
Jp: Tesuto no mae nanode mune ga DOKI DOKI simasu.
(テストのまえなので、むねがどきどきします)
En: My heart is throbbing because the exam starts soon.