Foreign trade, also known as "international trade" or "import and export trade", refers to the exchange of goods and services between one country (region) and another. This type of trade consists of two parts: import and export. For the country (region) that imports goods or services, it is called import; for the country (region) that exports goods or services, it is called export. This phenomenon emerged and developed in slave societies and feudal societies, and became even more rapid in capitalist societies. Its nature and function are determined by different social systems.

Equivalence trade: A trade method where the seller purchases goods or services of equivalent value from the buyer.

Exhibition trade: An international fair or market held in the home country, where import and export transactions are conducted for a certain period of time.

Processing trade: Also known as "three-in-trade", it includes processing trade with imported materials, assembly trade with imported components, and sample processing trade. It is also called processing trade.

Compensation trade: First, import machines, equipment, and technologies from abroad in the form of credit purchase. After production begins, use the products and services produced to repay the principal and interest of the loan. (Compensation trade combined with processing trade is usually called "three-in-one-compensation".)

What is roller anti-collision guardrail?

The roller anti-collision guardrail is composed of rotating drum, steel column, steel beam, fastener, etc. With a push of the hand, the rotating bucket in the middle can turn. The rotary drum has the characteristics of high elasticity and wear resistance, which is strong enough to avoid being broken and absorb a large amount of impact force 

When the vehicle collides with the rolling guardrail, the driving direction of the vehicle is first corrected through the rotating barrel set on the guardrail to restore it to the normal running track to avoid impact rebound and cause secondary accidents; Secondly, the use of high and high-strength anti-collision protection beams set on the drum guardrail effectively prevents the vehicle from turning over the side of the road.

While avoiding the "hard" situation between the previous vehicle and the traditional guardrail, it can prevent the car from crossing the guardrail and driving out of the driving lane, thus effectively reducing the consequences of the accident and protecting the personal safety of the passengers to a great extent