This is a calculation of the lens field of view of the software, very simple but very practical.
这是一个计算镜头视场的软件，非常简单但是很实用。
Wastes sorting itself is a very simple and practical waste management option, but it faces so many obstacles regarding to its implementation.
垃圾分类本身是一个很简单，可行的垃圾处理方案，但怎么实施起来，总是困难重重。
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