同时，讨论了一类M -完全正则半环的坚固构架结构。
At the same time, we investigate the sturdy frames of M-completely regular semirings.
城市环 境是一个人造的、自然的和半自然的生境镶嵌 体，与邻近乡村地区的气候和水文条件完全不 同。
The urban environment is a mosaic of man-made, natural and seminatural habitats with climatic and hydrological conditions, which distinguish it from adjacent rural areas.
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