Who can tell me the meaning and difference of (post office registration, parcel, EMS, express delivery)! thank you

Registration is guaranteed! Ordinary mail parcels are slow and cheap. You have to pick it up yourself. If you want to send it, you have to add a service charge! EMS is more expensive, delivered to your door, no matter where you go! Express delivery; Each has its own price, but most of them only go to the city and not to the countryside. But they are all cheaper than EMS.

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