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。My watch is faster, and I need calibrate it.我的表走快了，我得把它校准。A direct means is required to calibrate the indirect method.要求用直接测定法校正间接测定法....
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。to calibrate an instrument校准仪器...instructions on how to calibrate a thermometer.如何标定温度计的说明A direct means is required to calibrate the indirec...