sliding head

例句：

1. 1.The car's engine is producing a lot of noise when it's in motion.
   汽车在运动时发动机会产生很多噪音。
2. 2.The team's performance was disappointing, but the players kept their heads up and tried to improve.
   团队的表现令人失望，但球员们保持了冷静，并试图改进。
3. 3. The scientist carefully observed the experiment and recorded the data for future analysis.
   科学家仔细观察了实验并记录了数据以便将来分析。