This kind of product is worthless for all practical purposes.
这种产品毫无实用价值。
All practical windmills fall into two different categories and two different configurations.
所有实用风车划分为两个不同的类别和两种不同的结构。
All practical windmills fall into two different categories and two different configurations.
所有实用风车划分为两个不同的类别和两种不同的结构。
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