Product: An abstract product class.
Product：抽象的产品类。
The product and create classes are abstract.
product和creator类是抽象的。
Abstract: the fatigue life of the product was an important characteristic of modern design.
摘要：产品的疲劳寿命是现代设计的一个重要指标。
Abstract: the fatigue life of the product was an important characteristic of modern design.
摘要：产品的疲劳寿命是现代设计的一个重要指标。
应用推荐