1、A hand grenade exploded by accident and I got lost in the ensuing confusion
＂一枚 * 意外地發(fā)生了 * ，接著是一片混亂，使我不知所措。＂

2、A hand grenade was thrown at an army patrol.
一顆 * 被扔向陸軍巡邏隊。

3、A hand grenade is a missile weapon
* 是一種投擲武器。