有文字记载的人类历史,共发生了一万五千多次战争,平均每年三次多。没有战争的年份只有二百九十四年。第一次世界大战,有三十三个国家十亿人直接参加了战争,占当时世界人口百分之六十二,受伤人员二千万,死亡二千五百万。第二次世界大战,有六十一个国家二十亿人口直接参加了战争,占当时世界人口百分之八十,受伤人员三千五百万,死亡五千五百万。 There are written records of human history, a total of more than 15,000 wars, an average of more than three times per year. The war-free year was only 294 years. During World War I, one billion people in 33 countries took part directly in the war, accounting for 62% of the world’s population at that time, 20 million injured and 25 million dead. During the Second World War, two billion of the 61 countries directly participated in the war, accounting for 80% of the world’s population at that time, 35 million injured and 55 million dead.