传统的全光微波滤波器大多是正系数，只能实现低通或等效带通。

All-optical filters with all positive coefficients can only function as low-pass filters or equivalent band-pass filters by traditional approach.

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参数曲线的保形性与生成它的基函数的规范化全正性有关。

Shape preservation of parametric curves is associated with normalized total positivity of its basis functions.

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汽车生产商们正争先恐后的生产油电混合动力车，这普遍被认为是迈向全电动车的一步。

Carmakers are now racing to build petrol-electric hybrid vehicles, and these are widely seen as steps on the way to all-electric ones.

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