The safetyscrew is one of the most important parts of the paper knife.
切纸刀保护螺栓是切纸刀的关键保护部件。
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Summary of Background Data. Safety concerns have driven specific interests in the accuracy and precision of pedicle screw placement.
背景资料概述：由于安全性的关系，使得人们对椎弓根螺钉置钉的准确性和精确度有着特殊的兴趣。
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Conclusion: Using the manual aiming device for the cervical pedicle for screw placement can improve the accuracy and safety during operation, and this device can be applied and popularized clinically.