我们把车开进X光隧道进行X光检查。
根据多普勒效应，光被离子反射后，靠近激光器的光的频率会高于远离激光器的光的频率，（日常生活中，救护车警报器的音调随着车的远近也变化，就是这个道理）这才有可能测量先前对离子施加的力的大小。
(An everyday example of this effect is the change of pitch of an ambulance siren as it approaches and recedes.) It was thus possible to measure the force applied to the ions.
如果你在这个时间段拍摄，你不仅会捕捉到车的光而且天空中的干扰光可以烘托照片的氛围。
If you shoot at this time you'll not only capture light from cars, but ambient light in the sky which can add atmosphere to your shots.
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