In foreign trade, s s usually refers to "stainless steel" (stainless steel). Stainless steel is widely used in foreign trade, especially in the manufacture of kitchen equipment, buildings and automobile parts. Its excellent corrosion resistance and beautiful appearance are one of the reasons why it is widely used. Stainless steel can also be used to make tableware, jewelry, watches, medical instruments and other precision equipment.

In addition, s s may also mean "sailing date". In foreign trade, when goods need to be shipped by sea, exporters usually need to check the shipping date to determine the best delivery time. The shipping schedule can also be used for exporters to communicate and negotiate with shipping companies in advance so as to complete all necessary formalities and preparations before delivery.

S s can also stand for "sample shipment". In foreign trade, exporters need to provide samples to customers for quality inspection and confirmation, which requires the use of sample transportation services. The requirements of sample transportation are different from normal cargo transportation, and it usually needs express delivery and professional packaging to avoid damage and loss. This usually requires extra time and expenses, so exporters need to arrange the sample transportation schedule reasonably.