This study strapped a small device with an accelerometer to the participant's heads to monitor what sleeping positions they were in and for how long.

这项研究中，患者的头上会系上一个加速计用来监测其睡姿和保持睡姿的时长。

Air traffic control uses them to monitor aircraft positions on information screens, ensuring that they do not break minimum separation while flying.

空中交通管制使用它们来监控飞机在信息屏幕上的位置，确保它们在飞行时不会违反最小间隔。

Investigators and experts concluded that the culprit responsible for the devastation was a powerful and sudden wind storm and that the fallen trees hit the ground with enough force to register as an earthquake on a seismic monitor positioned nearby.

调查人员和专家得出结论，造成破坏的罪魁祸首是一场猛烈而突然的风暴，倒下的树木以足够的力量撞击地面，在附近的地震监测仪上记录为地震。