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Synthetic fiber (synthetics) is a kind of chemical fiber, which is a general term for chemical fibers made from synthetic polymer compounds. It uses small molecular organic compounds as raw materials, and is a linear organic polymer compound synthesized by polyaddition reaction or polycondensation reaction, such as polyacrylonitrile, polyester, polyamide, etc. It can be seen from the classification of fibers that it belongs to a category of chemical fibers.

Air transport means ordinary air transport. When transporting large quantities of goods、 the general freight will be cheaper than express delivery. However、 they need to deliver the goods themselves、 declare customs and even apply for inspection. It may also inspect the goods.

Express delivery is not necessarily air transportation. If it is international transportation、 the delivery time in some places is not necessarily faster than ordinary air transportation. But usually、 there is no need for customs declaration and inspection、 and it is convenient to pick up and deliver goods at home.

If you have sent international postal surface mail packages、 you will know that the advantage of surface mail lies in its wide coverage、 many corners can be sent、 but it can be said to be the slowest logistics、 many times it can not be tracked、 and remember that there is no bottom in the process center. The delivery process of registered mail is more clear、 and it will bear certain responsibility for loss and damage、 so it is faster and safer. In terms of cross-border special line logistics、 it is also of similar significance. For example、 TODROPSHIPPING、 which specializes in e-commerce special lines、 has 5-8 working days for registered express mail to arrive in the United States. At the same time、 tracking inspection is supported. In some countries、 it can be re dispatched twice、 while ordinary mail takes 8-10 working days. Not only can it not be tracked、 but also there is no return or compensation service. When you are in a hurry、 if you cannot find a piece、 you just wait. Of course、 the cost of ordinary mail will be cheaper than that of registration.

The characteristics of special logistics lines are as follows

1. Logistics special line refers to two points and one line transportation

2. Goods have a common distribution center

3. Own operation system

4. Straight line arrival、 no transfer、 no unloading