“在公交车上”到底是in the bus还是on the bus？

我在公交车里吃午饭
可以说成
I'll have lunchinthe bus吗?
有人说 onthe bus这个搭配更常见
但是 onthe bus
总给我一种在车顶上的感觉
到底应该怎么理解呢？

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The phraseon the busis quite standard and normal.
on the bus这个短语是一个很标准很普遍使用的搭配。
The use ofondoes NOT imply that the person is on the roof. Basically, if the speaker is taking a long trip by bus, that person is said to beon the busduring the entire trip.
这里on的使用，并不是意味着这个人在位置层面的on。基本上，如果一个人说他搭公交车旅行，那么就应该表达成他在旅行中一直是 on the bus 的。
When a person is boarding a bus, we d typically say the person is gettingona bus. (And at the end of the trip, it would also be quite normal to say that person is gettingoffthe bus.)
当一个人要搭乘公交车，我们就会说这个人正在getona bus。（并且，当他下车时，我们会用getoffthe bus来表达）

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究竟什么时候用on什么时候用in？
If there is no compartment involved, you get ON it. (bicycle, motorcycle, skateboard, etc.) (Note: partial compartments, such as those of convertible cars or open-topped boats, count as compartments; pretty much anything where the vehicle at least partially surrounds you.)
如果交通工具没有隔间，你就用on。(自行车、摩托车、滑板等)(注:有不是完整隔间的，如敞篷车、敞篷艇等，也算作隔间；几乎就是有东西遮挡在你周围就算是了。)

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Oddly enough, if the transportation is large enough to allow you to move around freely, you also get ON it. (Bus, train, large boat, passenger plane, etc; anything with an aisle or walkway.)
尽管很奇怪，如果交通工具大到可以让你自由移动，你也用on。（公共汽车、火车、大型船舶、客机等;任何有过道或走道的东西。)

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Otherwise, you almost certainly get IN it. (Car, personal aircraft, canoe, etc.)
除此之外，你就用in。（汽车、私人飞机、独木舟等）
今天的内容都学会了么？
欢迎评论交流心得~

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【 “在公交车上”到底是in the bus还是on the bus？】
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