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Now many women will choose to wear tight underwear during menstruation, they think that this can not only avoid the embarrassment of side leakage, but also relieve abdominal pain to a certain extent, in fact, this is unscientific, women in the menstrual period is best to choose slightly looser underwear. Women must know what underwear to wear during menstruationForeign medical studies have shown that a large proportion of gynecological diseases are caused by wearing tight underwear. Endometriosis is currently a disease with a high incidence and one of the causes of the disease is endometriosis caused by reverse flow of blood into the abdominal cavity, and the most common problems in patients are dysmenorrhea and infertility. If women often wear tight underwear, especially during menstruation, it is easy to make menstrual blood flow poorly, and when taking off, it will also make the pelvic and abdominal pressure suddenly change, which can easily cause menstrual blood reverse flow, and eventually menstrual back pain, abdominal pain, and even lead to infertility.

Air freight price calculation method:

（1） Air freight charge weight

According to the provisions of the airline、 when the cargo is small and heavy、 it shall be calculated according to the actual weight; In case of large volume and small weight of goods、 it shall be calculated by volume. A batch of goods consists of several different goods、 including light goods and heavy goods. The billing weight shall be the total gross weight or total volume weight of the whole batch of goods、 whichever is higher.

（2） Air freight price calculation and cost category

1. Rates;

2. TRANSPORTATIONCHARGES;

3. The airlines charge the international air freight according to the three regional rates set by the International Air Transport Association;

4. There are four main types of air freight: (1) general freight; (2) Freight rate of special goods or designated goods; (3) Class freight rate of goods; (4) Freight rate of container cargo

（3） Minimum freight

The minimum freight that the airline can accept for handling a batch of goods、 regardless of the weight or volume of the goods、 and the minimum amount that should be charged for transporting a batch of goods between two points. Different regions have different minimum freight rates.

（4） Other provisions on air freight price calculation

All the different air freight rates and charges have the following common points: the freight rate refers to the transfer from one airport to another. It is only applicable to a single direction; Other additional costs are not included. Such as picking up、 customs declaration、 delivery and warehousing expenses. Freight rates are usually published in local currency. Freight rates are generally calculated in kilograms or pounds. The freight rate in the air waybill is based on the applicable freight rate on the date when the air waybill is issued.

For international express delivery、 we often use the four major express DHL、 UPS、 FedEx、 TNT and EMS. The international express delivery time is normally 3-7 days、 depending on your time limit requirements、 where to send、 and the need for fast time limit、 you can refer to DHL express delivery. DHL express delivery can reach major countries and regions in 3-5 days.

1. Freight accounting of international air transportation to foreign airports: total cost=unit price (price of each level) * weight+local CHARGE

Local CHARGE mainly includes: DOC bill of lading fee+CUS customs clearance fee+CISS entry fee (Shenzhen and Guangzhou do not charge)

Other possible expenses: vehicle inspection fee and inspection fee

Length multiplied by width multiplied by height/6000

2. Freight accounting of air transportation double clearance tax to Dubai: the goods are divided into ordinary goods、 brands、 sensitive goods、 etc.、 and the price of all inclusive goods is calculated according to different types. Double clearance of air transportation tax、 free door-to-door delivery to addresses within the scope of overseas delivery、 and remote fees are paid for those with remote overseas addresses.

3. Accounting of international marine full container or bulk cargo arriving at the port of destination:

From the factory to the ship: the towing fee from the factory to the wharf、 THC from the wharf、 lead sealing fee、 shipping company's document fee、 other miscellaneous fees at the wharf、 etc. (depending on different ports)

Sea transportation: sea freight、 sea surcharge、 etc

4. International shipping full container/bulk cargo double clearance accounting:

Full container and double clearance: calculate the full inclusive price of all the expenses of the trailer customs declaration、 sea transportation and customs clearance at the port according to the details of the goods

Double clearance of bulk cargo: calculated per cubic meter、 all inclusive to the destination