1. "Sometimes even gendarmes use their heads.
    “即使宪兵们有时也会动动脑筋。

2. In former times, prisoners´ heads were impaled on pointed stakes.
    从前的人把监犯的头钉在尖桩上.

3. From time to time they slapped at the mosquitoes, or put their heads into the smoke to get rid of the pests.
    他们不时还拍打着蚊子，或是把他们的头放到烟幕中来驱除害虫。