卫

例句：

1. 1. The soldiers were vigilant in their defense of the border.
   士兵们警惕地守卫着边境。
2. 2. The government is committed to protecting the environment.
   政府致力于保护环境。
3. 3. The villagers gathered to protect their crops from the storm.
   村民们聚集起来保护他们的庄稼免受暴风雨的侵害。