兵役

例句：

1. 1. He decided to serve his country in the military.
   他决定为国家服务，参军。
2. 2.The young man was drafted into the army at the age of 18.
   这位年轻人在18岁时被征召入伍。
3. 3.The soldier's bravery saved many lives during the battle.
   这位士兵的勇敢在战斗中拯救了许多生命。