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by nature; by birth; naturally; natural; innate
彼女は生れつき絶対音感を持っていたそうだ。
Apparently she has had perfect pitch since birth.
この犬は生れつき片方の目が見えないらしい。
This dog seems to have been blind in one eye since birth.
生れつきの才能だけでなく努力も必要である。
Not only innate talent but also effort is necessary.