如果这个国家参战，我们将不得不面对许多人会死亡的事实。

If this country goes to ___war, we will have to face the fact that many people will die.

英国和法国在1939年向德国宣战。

Britain and France declared ___war on Germany in 1939.

核战争对人类是一个可怕的威胁。

Nuclear ___war is a terrible threat to humanity.