The first direction and the second direction mutually form a fixed Angle.
该第一方向与该第二方向互成一个固定角度。
The first hollow member defines a second hollow space extending in the first direction.
所述第一中空部件界定有在所述第一方 向上延伸的第二空腔。
The first hollow member defines a second hollow space extending in the first direction.
所述第一中空部件界定有在所述第一方 向上延伸的第二空腔。
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