... subset子集 subsidiary angle辅助角 substitute代入 ...
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subsidiary angle steel extension 延长辅助角钢
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Oar-blade set is composed of main oar-blade 4 and subsidiary one 2. which lean and stagger some angle with the level and are laid relatively in direction.
浆叶装置由主浆叶4和副浆叶2构成，主、副浆叶与水平面倾斜，相错一定角度，方向相对布置。
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