他证明了平行线的存在性。
其次，提出了综合利用空间平行线约束和相机主点位置约束的线性迭代自定标方法，提高了相机自定标的鲁棒性。
Secondly, a new method with scene constraint and the constraint of principal point for camera self-calibration based on the linear iteration is presented.
袋口热合封口机，可同时缝制两条平行的双线链式线迹，具有更佳的密封性。
Model GK8-24 double-needle four-thread bag sewing closer adapted two paralleled double thread chain stitch with auto-cut system.
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