From each high-level step, "drill down" to a more detailed flowchart on a new page.

从每一高级步骤，“深入”到新页上更详细的流程图。

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Normal bone drill: variable speed control without step, reliable, economical price.

普通骨钻：无级变速，性能可靠，经济实惠。

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Normal bone drill: variable speed control without step, reliable, economical price.

普通骨钻：无级变速，性能可靠，经济实惠。

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