Back then the cars had a trap door that we could pull open with a chain to check our tire wear.
那时的汽车有一个活板门，我们可以用链子把它拉开，检查轮胎的磨损情况。
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那时的汽车有一个活板门，我们可以用链子把它拉开，检查轮胎的磨损情况。