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As to the common perpendicular plane of the two planes, some discussionis made in detail.
关于两平面的公垂平面，也作了详细的说明和论证。
youdao
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The plane is landing back up to meet the enemy planes.
行将降落的飞机重新冲天而起，迎向敌机。
youdao
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The plane is landing back up to meet the enemy planes.
行将降落的飞机重新冲天而起，迎向敌机。
youdao