First, you must sit by the window when you get on the bus, and you must open the window. This is what long-distance travelers must pay attention to. If there is no condition to open the window, you can use a book or a fan to fan it, which can alleviate it.
Second, let your chest shine and pay attention to your posture. This is very important.
Third, keep a cheerful mood, never play with your mobile phone, and try to look out of the window. This is the key point, but it is also the reason why many people get carsick.
Fourth, if you feel dizzy, you should drink water properly and eat cold things, such as fruit. Really can't. Spare carsickness medicine.