• 1. direct or reverse: 正向或反向的
• 2. Direct or reverse acting: 正反作用
• 3. direct or reverse circulation: 正反循环

• 1.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。
  dict.yoduao.com
• 2.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。
  dict.yoduao.com

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