Pesticide levels in food are simply too difficult to calibrate.食品中杀虫剂的含量很难精确测定。Before you pull the trigger, you have to calibrate the distance between you and your target.在扣动扳机之前，你得先校准你和目标之间的距离。They calibrate their responses to the urgings of public-relations men.他们按照公关人员的急切要求作出相应的反应。