该相机聚焦设备的优点是结构简单，安装方便，生产成本低。
The camera lens focalizer has the advantages of simple structure, convenient installation and low production cost.
此两种方法工艺简单，生产效率高，生产成本低。
These two methods have the characteristics of simple process. high production efficiency and low production cost.
但是什么大小和形状的纳米颗粒的效果最好且生产成本低？
But what size and shape of nanoparticles is most effective and can be produced cheaply?
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