to study or investigate something deeply
何かを深く調べること (nanika o fukaku shiraberu koto)
"You need to look into research materials before writing your paper."
"論文を書く前に研究資料を調べる必要があります。" (Ronbun o kaku mae ni kenkyū shiryo o shiraberu hitsuyō ga arimasu.)
to continue going; to tell someone to keep moving
to develop or improve international agreements that already...
to use something so much that it becomes unusable
to reject an offer or opportunity
to gradually develop skills or actions that lead to success
to mix naturally with people or surroundings
