出处：按学科分类—语言、文字 中国对外翻译出版公司《汉英成语词典》第105页（211字）
由习惯养成性格，例他从小就不大爱说话，习与性成，现在还是沉默寡言。
As a youngster he kept to himself and did not talk much．Now that he has grown up this reticence has become second nature to him