Generally speaking, both sides can be brushed, preferably a brush with a chip. There is an upward red arrow on the credit card machine, and you can swipe your card above the arrow. Sometimes, the credit card reader may not be able to issue a continuous long prompt tone "beep". At this time, just continue to brush, or brush backwards. If it really doesn't work, turn it off and restart before brushing. The switch is behind the card reader. In short, hearing a short "beep" means that the card is successful. In fact, it is very simple to swipe your card, but you should be smart by car. If there is only one child on the platform, it is better to raise your hand when you see the car coming, otherwise some drivers may think that no one wants to get on the bus and may stop. If you want to get off, you'd better stand at the back door in advance, otherwise some drivers will start as soon as they stop, or no one will stop at the back door. Once you pass the station, you won't get off. Be more careful if the car is crowded at the door. Don't get caught opening and closing the door. If the driver closes the door before standing up, you should boldly tell him to close the door slowly, or the child will be unbearable if he is caught.