Only unmirrored dbspaces and temporary dbspaces can have a non-zero extend size, because chunks cannot be extended in any other type of space.
只有未镜像的 dbspaces 和临时 dbspaces 可以有一个非零 extend size，因为不能在任何其他类型的空间中扩展块。
The New Type Spiral Bevel Gear with Non-Zero-Modification is an invention.
非零传动曲齿银齿轮是一种发明。
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