backward pass 偶数道次
- Backhand: A deceptive shot or pass flipped backward.
腕 球:虚假射门或巧妙回传球。 - Secondly, researched double pass forward and backward erbium-doped fiber source experimentally.
其次对双程前向和后向结构掺铒光纤光源进行实验研究。 - The advantages of the production for the aluminium alloy casing with backward extruding technology replacing multi-pass ironing technology are marrated.
叙述了用反挤压工艺代替多道变薄拉伸工艺生产铝合金外壳的优点。
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