推移: to undergo a change

数詞: linguistic numeral

数日: a few days

Ah!

(idiomatic) A piece of cake; an extremely simple thing, something trivial, a cinch, easy as pie.

朝飯前: A piece of cake; an extremely simple thing.

(telephony) a common Japanese telephone greeting: hello; used when answering the telephone / used to confirm that the person being addressed is listening, or to confirm if anyone is listening

put away

absorbing (knowledge) very quickly and naturally

sleep