However, for the composite load has the characteristics of complex composition, random time variance and spread over different area, its exact mathematics model is still not built up.
然而，系统中的综合负荷，由于具有构成复杂、随机时变、地域分散等特点，其准确的数学模型一直没有建立起来。
Ms. Zhou said her house, built over 10 years ago, was brick, which is common in this area.
周女士说她们家是10前建成的，是砖房，这种结构在当地很普遍。
From the architect. Xixi, a national wetland park located on the outskirts of Hangzhou, is a built landscape and an area of nature, which has been shaped by man for over a thousand years.
来自事务所的描述：位于杭州郊区的西溪国家湿地公园，兼有人工景观和自然区域，它们已经被人类塑造了千年。
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