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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。

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"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。”

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These make possible sturdy furniture without a single dowel, nail or screw.

FORBES: Green Wood