Plot the gain against a time constant, and the shape of the curve tells you the age of the ceramic. Theoretically.
理论上，根据时间变化绘制出所增重量，所绘曲线的形状就可以表明陶瓷的年龄。
2
But focusing on close objects involves contraction of muscles controlling the shape of the eye's lens. And one possibility is that "this constant contraction may stretch the eyeball.