There was a time when seatbelts in cars were optional. Airbags, too, were once considered a luxury, reserved for high-end models. Now, we wouldn’t think of driving without them.
曾几何时，汽车上的安全带是可选的配置。安全气囊也曾被视为高端车型的奢侈专供。而现在，没有这些东西，我们根本不敢开车。
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