比较两组间螺钉钉道准备时间及置入螺钉的准确率。
Preparative time of screw canal and accuracy of screw were compared between two groups.
ORSO的技术专家避免采用卫星定制框架，而使用了省时的钉板盒，盒上每隔5厘米就凿了一个螺钉孔。
Shunning made-to-order satellite frames, ORSO's technologists use time-saving pegboard boxes perforated with screw-holes five centimetres apart.
他用了这样一个例子：木匠通常是怎么知道在什么情况下用直钉，什么情况下用螺钉的。
He gives the example of how a carpenter will often know that a nail works better in certain situations and screw better in others.
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