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to feel ashamed
自分の無知を恥じることなく、積極的に質問すべきだ。
You should ask questions proactively without feeling ashamed of your ignorance.
過去を恥じることなく、前向きに生きる。
Live positively without feeling ashamed of the past.
彼は自分の未熟さを恥じて、さらに努力を重ねた。
Ashamed of his own immaturity, he redoubled his efforts.