Before this switch was thrown, we didn't have in-car navigation systems giving turn-by-turn directions, because back then, GPS couldn't tell you what block you were on, let alone what street.
在这个开关开启前，我们没有 车载导航系统给我们一个转弯接转弯的指向， 因为在过去，GPS连你在哪个街区都不知道， 更不用说街道了。