a subject of disagreement or dispute
意見の相違または争いの対象 (iken no sooi mata wa arasoi no taishou)
"Money has always been a bone of contention between them."
"お金は常に彼らの間で争いの種でした。" (okane wa tsuneni karera no aida de arasoi no tane deshita)
expressing one’s own personal view
dreams or plans that are impossible or unrealistic
Being too inquisitive can lead to trouble.
to take responsibility for something difficult or unpleasant
to work hard and continuously
to stay focused on your goal