It is believed that priority is given to reverse direction drive in the case that it may be driven in ether direct or reverse direction, especially under large water flushing conditions.

并认为在斜井既可正掘又可反掘的条件下，尤其是在涌水量较大的情况下应优先考虑反掘方案。

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A patent prevents direct copying, but does not prevent learning from a new product or developing a competing product through reverse engineering.

专利权能够阻止直接的复制，但是不能阻止学习新产品的行为、或通过反向工程学开发可与之竞争的产品的行为。

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