pile helmet

例句：

1. 1.The firefighters used a pile cap to protect their heads from the intense heat.
   消防员们使用堆叠式头盔来保护他们的头部免受高温伤害。
2. 2. The driver had to put on his pile cap before starting the engine.
   司机在启动引擎前必须戴上他的堆叠式头盔。
3. 3. The athletes wore pile caps during the race to protect their faces from the wind and dust.
   运动员们在比赛中戴着堆叠式头盔，以保护他们的脸免受风沙的侵害。