The old isotope gauge has a lot of shortcoming, such as the unadvanced equipment, the imperfect monitoring system, the fussy calibration method and so on.
原有同位素测厚仪存在着设备落后，监测系统功能不完善，测量精度不高，以及标定方法繁琐等不足。
2
Efficiency of domestic hydraulic excavator cannot compare with those have been produced by some known foreign enterprises because of unadvanced technique, so they waste more energy.