screw nail

He gives the example of how a carpenter will often know that a nail works better in certain situations and screw better in others.

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。

"The rollercoaster is wooden and so unlike rides made from iron and steel there was always a chance of the odd nail or screw that would not be entirely flat," he said.

奥尔说：“这个过山车道不是由钢铁制成的，它是木制的，由此，有可能有旧钉子或者螺丝翘起造成轨道的不平坦。”

Numerous studies have been published regarding the comparison between intramedullary nail and the dynamic hip screw and plate for the fixation of intertrochanteric fractures in elderly patients.

许多已经发表的研究有关髓内钉与动力髋螺钉和钢板的高龄患者股骨粗隆间骨折内固定的比较。