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The tyre's flat—the nail has gone right through.

轮胎瘪了，让钉子扎穿了。

《牛津词典》

"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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