公园是一个保护区，在自然或半自然状态，或种植，并为人类娱乐和享受，或为保护野生动物或自然栖息地。

A park is a protected area, in its natural or semi-natural state, or planted, and set aside for human recreation and enjoyment, or for the protection of wildlife or natural habitats.

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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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对矩阵变换器的空间矢量调制法以及半自然两步换流技术进行了分析及阐述，同时研制了一套矩阵变换器样机。

Detailed analysis and description on space vector modulation and two-step commutation were given, and a prototype matrix converter was built.

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Now I didn't use--no hands-- that was just the notes that are naturally on the twelve and a half-foot length of vibrating air.

我没有用手控制,都是十二个半英尺高的震动空气柱,自然产生的音符

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