The chemical products obtained from lard as raw material by optional chemical treatment and processing were emphatically introduced. 重点介绍了以猪油为原料，经适当的化学处理和加工所得到的化学产品。
In micrographics,the use of a laser to write directly on a microfilm to produce instantaneous storage without any need for chemical processing. 在显微照相技术中，使用激光把计算机输出直接写到缩微胶片上，实现快速存储，而不需要任何化学处理。
