"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。”
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。
Some riders put a dab of nail polish on the binding's screw threads to help keep the screws in place.
有一些滑雪者会往固定器的螺丝上涂上指甲油保证螺丝不会松动。
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