Another reason that you aren't asked to confirm starting your car or buying groceries is that these operations are easy to undo. You just turn off the key or return the unwanted item.
我们不需要确认的另一个理由是开车和买东西都是可以恢复的操作：你可以将钥匙旋回来或者将不要的东西退回。
Other operations in life don't require confirmation. Your car does not ask, "do you really want to start the engine?" when you turn the key.
生活中的操作从来不需要确认：当你旋转钥匙的时候，汽车不会问你：“你真的确定想要启动引擎么？”
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