• 人の天性
    • the nature of human beings
    • 習慣は第二の天性と言われる
    • Habit is said to be second nature.
    • 楽天的なのは彼の天性だ
    • His optimism is inborn./He is optimistic by nature.
    • 彼は天性明朗だ
    • He was born with a cheerful disposition.