... harmonic pencil of planes 调和面束 harmonic pencil 调和束 harmonic perspectivity 调和透视性 ...
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调和线束 [数] harmonic pencil of lines
调和面束 [数] harmonic pencil of planes
调和约束 Align Constraints
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本文阐明一种能作出调和线束以至调和点的仪器；
The invented instrument founded on the charasteristics of harmonic points can be used for many purposes.
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