I specifically asked an old man in this industry, and he said that it was not to restrict imports, but because there was no profit.

For example, a 20-foot container can hold about 20 tons, but you have to install fishing nets. Because it is big and light, it can only hold 8 tons, so you bought a box with half the weight. It will lose money. This is the main reason why many people don't make fishing nets.

As for customs clearance. . Um ... This can be achieved by finding a similar proxy. As long as you don't meet the agent of 2 goods, there is no problem.