In the past, several methods of refrigerating trucks have been used.These include ice, ice and salt, dry ice, hold-over plate systems, cryogenic systems, and mechanical refrigeration.

• 过去人们采用很多方法对货车进行制冷，这些方法包括：冰、冰和盐、干冰、蓄冷板系统、低温系统和机械制冷等。